400393638492 has 12 divisors (see below), whose sum is σ = 934251823176. Its totient is φ = 133464546160.

The previous prime is 400393638461. The next prime is 400393638521. The reversal of 400393638492 is 294836393004.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 16683068259 + ... + 16683068282.

It is an arithmetic number, because the mean of its divisors is an integer number (77854318598).

Almost surely, 2^400393638492 is an apocalyptic number.

It is an amenable number.

400393638492 is an abundant number, since it is smaller than the sum of its proper divisors (533858184684).

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

400393638492 is a wasteful number, since it uses less digits than its factorization.

400393638492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33366136548 (or 33366136546 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 51.

The spelling of 400393638492 in words is "four hundred billion, three hundred ninety-three million, six hundred thirty-eight thousand, four hundred ninety-two".