400024321686 has 128 divisors (see below), whose sum is σ = 994376908800. Its totient is φ = 118153637280.

The previous prime is 400024321679. The next prime is 400024321721. The reversal of 400024321686 is 686123420004.

400024321686 is a `hidden beast` number, since 400 + 0 + 243 + 2 + 1 + 6 + 8 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 400024321686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12422875 + ... + 12455033.

It is an arithmetic number, because the mean of its divisors is an integer number (7768569600).

Almost surely, 2^400024321686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400024321686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (497188454400).

400024321686 is an abundant number, since it is smaller than the sum of its proper divisors (594352587114).

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

400024321686 is a wasteful number, since it uses less digits than its factorization.

400024321686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32711 (or 32705 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The spelling of 400024321686 in words is "four hundred billion, twenty-four million, three hundred twenty-one thousand, six hundred eighty-six".