12891391404 has 24 divisors (see below), whose sum is σ = 30099375600. Its totient is φ = 4294350144.

The previous prime is 12891391399. The next prime is 12891391411. The reversal of 12891391404 is 40419319821.

It is a super-2 number, since 2×12891391404² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328179 + ... + 365354.

It is an arithmetic number, because the mean of its divisors is an integer number (1254140650).

Almost surely, 2^12891391404 is an apocalyptic number.

It is an amenable number.

12891391404 is an abundant number, since it is smaller than the sum of its proper divisors (17207984196).

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

12891391404 is a wasteful number, since it uses less digits than its factorization.

12891391404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695089 (or 695087 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The spelling of 12891391404 in words is "twelve billion, eight hundred ninety-one million, three hundred ninety-one thousand, four hundred four".