1218997416 has 64 divisors (see below), whose sum is σ = 3750768000. Its totient is φ = 321493248.

The previous prime is 1218997391. The next prime is 1218997453. The reversal of 1218997416 is 6147998121.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276891 + ... + 281258.

It is an arithmetic number, because the mean of its divisors is an integer number (58605750).

Almost surely, 2^1218997416 is an apocalyptic number.

It is an amenable number.

1218997416 is an abundant number, since it is smaller than the sum of its proper divisors (2531770584).

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

1218997416 is a wasteful number, since it uses less digits than its factorization.

1218997416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558178 (or 558174 counting only the distinct ones).

The product of its digits is 217728, while the sum is 48.

The square root of 1218997416 is about 34914.1434951511. The cubic root of 1218997416 is about 1068.2369475249.

The spelling of 1218997416 in words is "one billion, two hundred eighteen million, nine hundred ninety-seven thousand, four hundred sixteen".