1220518904 has 16 divisors (see below), whose sum is σ = 2496516120. Its totient is φ = 554781280.

The previous prime is 1220518883. The next prime is 1220518907. The reversal of 1220518904 is 4098150221.

It is a super-2 number, since 2×1220518904² = 2979332790042722432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220518907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6934679 + ... + 6934854.

Almost surely, 2^1220518904 is an apocalyptic number.

It is an amenable number.

1220518904 is an abundant number, since it is smaller than the sum of its proper divisors (1275997216).

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

1220518904 is a wasteful number, since it uses less digits than its factorization.

1220518904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13869550 (or 13869546 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 1220518904 is about 34935.9256926162. The cubic root of 1220518904 is about 1068.6812016678.

The spelling of 1220518904 in words is "one billion, two hundred twenty million, five hundred eighteen thousand, nine hundred four".