402091816 has 32 divisors (see below), whose sum is σ = 863208000. Its totient is φ = 172008576.

The previous prime is 402091787. The next prime is 402091831. The reversal of 402091816 is 618190204.

It is a happy number.

It is an unprimeable number.

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, 25555 + ... + 38173.

It is an arithmetic number, because the mean of its divisors is an integer number (26975250).

Almost surely, 2^402091816 is an apocalyptic number.

It is an amenable number.

402091816 is an abundant number, since it is smaller than the sum of its proper divisors (461116184).

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

402091816 is a wasteful number, since it uses less digits than its factorization.

402091816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13201 (or 13197 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 402091816 is about 20052.2272079687. The cubic root of 402091816 is about 738.0884532998.

It can be divided in two parts, 40209 and 1816, that added together give a square (42025 = 205²).

The spelling of 402091816 in words is "four hundred two million, ninety-one thousand, eight hundred sixteen".