400931799965 has 16 divisors (see below), whose sum is σ = 487397755440. Its totient is φ = 316571988480.

The previous prime is 400931799923. The next prime is 400931799971. The reversal of 400931799965 is 569997139004.

It can be written as a sum of positive squares in 8 ways, for example, as 32420883364 + 368510916601 = 180058^2 + 607051^2 .

It is not a de Polignac number, because 400931799965 - 2¹⁰ = 400931798941 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 400931799898 and 400931799907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560906 + ... + 1056635.

It is an arithmetic number, because the mean of its divisors is an integer number (30462359715).

Almost surely, 2^400931799965 is an apocalyptic number.

It is an amenable number.

400931799965 is a deficient number, since it is larger than the sum of its proper divisors (86465955475).

400931799965 is a wasteful number, since it uses less digits than its factorization.

400931799965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618192.

The product of its (nonzero) digits is 16533720, while the sum is 62.

The spelling of 400931799965 in words is "four hundred billion, nine hundred thirty-one million, seven hundred ninety-nine thousand, nine hundred sixty-five".