222415440 has 80 divisors (see below), whose sum is σ = 742535808. Its totient is φ = 54747648.

The previous prime is 222415423. The next prime is 222415441. The reversal of 222415440 is 44514222.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 222415440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222415441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32524 + ... + 38763.

Almost surely, 2^222415440 is an apocalyptic number.

222415440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222415440 is an abundant number, since it is smaller than the sum of its proper divisors (520120368).

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

222415440 is a wasteful number, since it uses less digits than its factorization.

222415440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71316 (or 71310 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 222415440 is about 14913.5991631799. The cubic root of 222415440 is about 605.8823634243.

Adding to 222415440 its reverse (44514222), we get a palindrome (266929662).

The spelling of 222415440 in words is "two hundred twenty-two million, four hundred fifteen thousand, four hundred forty".