19972000400 has 60 divisors (see below), whose sum is σ = 52344808944. Its totient is φ = 7262544000.

The previous prime is 19972000393. The next prime is 19972000417. The reversal of 19972000400 is 400027991.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2265146 + ... + 2273945.

Almost surely, 2^19972000400 is an apocalyptic number.

19972000400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19972000400 is an abundant number, since it is smaller than the sum of its proper divisors (32372808544).

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

19972000400 is a wasteful number, since it uses less digits than its factorization.

19972000400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4539120 (or 4539109 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The spelling of 19972000400 in words is "nineteen billion, nine hundred seventy-two million, four hundred", and thus it is an aban number.