402161643 has 24 divisors (see below), whose sum is σ = 633137232. Its totient is φ = 244496448.

The previous prime is 402161633. The next prime is 402161651. The reversal of 402161643 is 346161204.

402161643 is a `hidden beast` number, since 4 + 0 + 2 + 1 + 616 + 43 = 666.

It is not a de Polignac number, because 402161643 - 2¹⁴ = 402145259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402161603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10996 + ... + 30417.

It is an arithmetic number, because the mean of its divisors is an integer number (26380718).

Almost surely, 2^402161643 is an apocalyptic number.

402161643 is a deficient number, since it is larger than the sum of its proper divisors (230975589).

402161643 is a wasteful number, since it uses less digits than its factorization.

402161643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41515 (or 41512 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 402161643 is about 20053.9682606710. The cubic root of 402161643 is about 738.1311761451.

The spelling of 402161643 in words is "four hundred two million, one hundred sixty-one thousand, six hundred forty-three".