12400978400 has 36 divisors (see below), whose sum is σ = 30273890472. Its totient is φ = 4960391040.

The previous prime is 12400978399. The next prime is 12400978489. The reversal of 12400978400 is 487900421.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7749812 + ... + 7751411.

It is an arithmetic number, because the mean of its divisors is an integer number (840941402).

Almost surely, 2^12400978400 is an apocalyptic number.

12400978400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12400978400 is an abundant number, since it is smaller than the sum of its proper divisors (17872912072).

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

12400978400 is a wasteful number, since it uses less digits than its factorization.

12400978400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15501243 (or 15501230 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 12400978400 in words is "twelve billion, four hundred million, nine hundred seventy-eight thousand, four hundred".