1312404978 has 64 divisors (see below), whose sum is σ = 2845320192. Its totient is φ = 402494400.

The previous prime is 1312404943. The next prime is 1312404991. The reversal of 1312404978 is 8794042131.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 395928 + ... + 399228.

It is an arithmetic number, because the mean of its divisors is an integer number (44458128).

Almost surely, 2^1312404978 is an apocalyptic number.

1312404978 is an abundant number, since it is smaller than the sum of its proper divisors (1532915214).

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

1312404978 is a wasteful number, since it uses less digits than its factorization.

1312404978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3439.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 1312404978 is about 36227.1304135450. The cubic root of 1312404978 is about 1094.8533620697.

The spelling of 1312404978 in words is "one billion, three hundred twelve million, four hundred four thousand, nine hundred seventy-eight".