402381972 has 24 divisors (see below), whose sum is σ = 1043212800. Its totient is φ = 134127288.

The previous prime is 402381949. The next prime is 402381977. The reversal of 402381972 is 279183204.

It is a super-2 number, since 2×402381972² = 323822502781217568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402381977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1862772 + ... + 1862987.

It is an arithmetic number, because the mean of its divisors is an integer number (43467200).

Almost surely, 2^402381972 is an apocalyptic number.

It is an amenable number.

402381972 is an abundant number, since it is smaller than the sum of its proper divisors (640830828).

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

402381972 is a wasteful number, since it uses less digits than its factorization.

402381972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3725772 (or 3725764 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 402381972 is about 20059.4609100045. The cubic root of 402381972 is about 738.2659494929.

The spelling of 402381972 in words is "four hundred two million, three hundred eighty-one thousand, nine hundred seventy-two".