400723947972 has 18 divisors (see below), whose sum is σ = 1012941090798. Its totient is φ = 133574649312.

The previous prime is 400723947961. The next prime is 400723948049. The reversal of 400723947972 is 279749327004.

400723947972 is a `hidden beast` number, since 4 + 0 + 0 + 72 + 39 + 479 + 72 = 666.

It can be written as a sum of positive squares in only one way, i.e., 370581432516 + 30142515456 = 608754^2 + 173616^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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, 5565610353 + ... + 5565610424.

Almost surely, 2^400723947972 is an apocalyptic number.

It is an amenable number.

400723947972 is an abundant number, since it is smaller than the sum of its proper divisors (612217142826).

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

400723947972 is a wasteful number, since it uses less digits than its factorization.

400723947972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11131220787 (or 11131220782 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 54.

The spelling of 400723947972 in words is "four hundred billion, seven hundred twenty-three million, nine hundred forty-seven thousand, nine hundred seventy-two".