222222500 has 60 divisors (see below), whose sum is σ = 491242752. Its totient is φ = 87924000.

The previous prime is 222222493. The next prime is 222222541. The reversal of 222222500 is 5222222.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 257069 + ... + 257931.

Almost surely, 2^222222500 is an apocalyptic number.

222222500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222222500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245621376).

222222500 is an abundant number, since it is smaller than the sum of its proper divisors (269020252).

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

222222500 is a wasteful number, since it uses less digits than its factorization.

222222500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990 (or 973 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 222222500 is about 14907.1291669456. The cubic root of 222222500 is about 605.7071166551.

Adding to 222222500 its reverse (5222222), we get a palindrome (227444722).

It can be divided in two parts, 2222 and 22500, that multiplied together give a triangular number (49995000 = T₉₉₉₉).

The spelling of 222222500 in words is "two hundred twenty-two million, two hundred twenty-two thousand, five hundred".