431396022978 has 54 divisors (see below), whose sum is σ = 941913137529. Its totient is φ = 142696110384.

The previous prime is 431396022977. The next prime is 431396022991. The reversal of 431396022978 is 879220693134.

431396022978 is a `hidden beast` number, since 4 + 3 + 1 + 3 + 9 + 602 + 29 + 7 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 354438050409 + 76957972569 = 595347^2 + 277413^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=464433.

It is a super-2 number, since 2×431396022978² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (431396022977) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 415202583 + ... + 415203621.

Almost surely, 2^431396022978 is an apocalyptic number.

431396022978 is an abundant number, since it is smaller than the sum of its proper divisors (510517114551).

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

431396022978 is an equidigital number, since it uses as much as digits as its factorization.

431396022978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384 (or 1193 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 431396022978 in words is "four hundred thirty-one billion, three hundred ninety-six million, twenty-two thousand, nine hundred seventy-eight".