402684561 has 8 divisors (see below), whose sum is σ = 596569760. Its totient is φ = 268456356.

The previous prime is 402684553. The next prime is 402684599. The reversal of 402684561 is 165486204.

It is not a de Polignac number, because 402684561 - 2³ = 402684553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402680561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7457095 + ... + 7457148.

It is an arithmetic number, because the mean of its divisors is an integer number (74571220).

Almost surely, 2^402684561 is an apocalyptic number.

It is an amenable number.

402684561 is a deficient number, since it is larger than the sum of its proper divisors (193885199).

402684561 is a wasteful number, since it uses less digits than its factorization.

402684561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14914252 (or 14914246 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 402684561 is about 20067.0017939901. The cubic root of 402684561 is about 738.4509604179.

The spelling of 402684561 in words is "four hundred two million, six hundred eighty-four thousand, five hundred sixty-one".