222222 has 64 divisors (see below), whose sum is σ = 612864. Its totient is φ = 51840.

The previous prime is 222199. The next prime is 222247.

It can be divided in two parts, 22222 and 2, that multiplied together give a palindrome (44444).

222222 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

222222 is a modest number, since divided by 2222 gives 22 as remainder.

222222 is a nontrivial repdigit in base 10.

It is a plaindrome in base 10.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to *n*+sod(*n*) for *n* = 222198 and 222207.

It is a congruent number.

It is an unprimeable number.

222222 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5988 + ... + 6024.

It is an arithmetic number, because the mean of its divisors is an integer number (9576).

2^{222222} is an apocalyptic number.

222222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 222222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306432).

222222 is an abundant number, since it is smaller than the sum of its proper divisors (390642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

222222 is a wasteful number, since it uses less digits than its factorization.

222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73.

The product of its digits is 64, while the sum is 12.

The square root of 222222 is about 471.4042850887. The cubic root of 222222 is about 60.5706662375.

The spelling of 222222 in words is "two hundred twenty-two thousand, two hundred twenty-two", and thus it is an iban number.

Divisors: 1 2 3 6 7 11 13 14 21 22 26 33 37 39 42 66 74 77 78 91 111 143 154 182 222 231 259 273 286 407 429 462 481 518 546 777 814 858 962 1001 1221 1443 1554 2002 2442 2849 2886 3003 3367 5291 5698 6006 6734 8547 10101 10582 15873 17094 20202 31746 37037 74074 111111 222222

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