402660645 has 16 divisors (see below), whose sum is σ = 644542080. Its totient is φ = 214657344.

The previous prime is 402660641. The next prime is 402660647. The reversal of 402660645 is 546066204.

It is not a de Polignac number, because 402660645 - 2² = 402660641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402660641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41136 + ... + 49974.

It is an arithmetic number, because the mean of its divisors is an integer number (40283880).

Almost surely, 2^402660645 is an apocalyptic number.

It is an amenable number.

402660645 is a deficient number, since it is larger than the sum of its proper divisors (241881435).

402660645 is a wasteful number, since it uses less digits than its factorization.

402660645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11884.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 402660645 is about 20066.4058814726. The cubic root of 402660645 is about 738.4363409162.

The spelling of 402660645 in words is "four hundred two million, six hundred sixty thousand, six hundred forty-five".