222215240 has 64 divisors (see below), whose sum is σ = 547646400. Its totient is φ = 80646912.

The previous prime is 222215239. The next prime is 222215243. The reversal of 222215240 is 42512222.

It is a super-2 number, since 2×222215240² = 98759225776515200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (222215243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27059 + ... + 34301.

It is an arithmetic number, because the mean of its divisors is an integer number (8556975).

Almost surely, 2^222215240 is an apocalyptic number.

222215240 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 222215240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273823200).

222215240 is an abundant number, since it is smaller than the sum of its proper divisors (325431160).

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

222215240 is a wasteful number, since it uses less digits than its factorization.

222215240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7326 (or 7322 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 222215240 is about 14906.8856573062. The cubic root of 222215240 is about 605.7005204410.

Adding to 222215240 its reverse (42512222), we get a palindrome (264727462).

The spelling of 222215240 in words is "two hundred twenty-two million, two hundred fifteen thousand, two hundred forty".