402331916844 has 144 divisors (see below), whose sum is σ = 1204680151584. Its totient is φ = 112540222080.

The previous prime is 402331916783. The next prime is 402331916863. The reversal of 402331916844 is 448619133204.

402331916844 is a `hidden beast` number, since 402 + 33 + 19 + 168 + 44 = 666.

It is a super-2 number, since 2×402331916844² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 402331916844.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 299962 + ... + 945854.

It is an arithmetic number, because the mean of its divisors is an integer number (8365834386).

Almost surely, 2^402331916844 is an apocalyptic number.

402331916844 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402331916844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (602340075792).

402331916844 is an abundant number, since it is smaller than the sum of its proper divisors (802348234740).

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

402331916844 is a wasteful number, since it uses less digits than its factorization.

402331916844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645949 (or 645922 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 402331916844 in words is "four hundred two billion, three hundred thirty-one million, nine hundred sixteen thousand, eight hundred forty-four".