13400673920 has 32 divisors (see below), whose sum is σ = 32035987620. Its totient is φ = 5360269312.

The previous prime is 13400673917. The next prime is 13400673943. The reversal of 13400673920 is 2937600431.

It can be written as a sum of positive squares in 2 ways, for example, as 11676099136 + 1724574784 = 108056^2 + 41528^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10468637 + ... + 10469916.

Almost surely, 2^13400673920 is an apocalyptic number.

13400673920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13400673920 is an abundant number, since it is smaller than the sum of its proper divisors (18635313700).

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

13400673920 is an equidigital number, since it uses as much as digits as its factorization.

13400673920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20938572 (or 20938560 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 35.

The spelling of 13400673920 in words is "thirteen billion, four hundred million, six hundred seventy-three thousand, nine hundred twenty".