402650261 has 32 divisors (see below), whose sum is σ = 468935040. Its totient is φ = 342641664.

The previous prime is 402650249. The next prime is 402650263. The reversal of 402650261 is 162056204.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402650261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402650261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402650263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2470166 + ... + 2470328.

It is an arithmetic number, because the mean of its divisors is an integer number (14654220).

Almost surely, 2^402650261 is an apocalyptic number.

It is an amenable number.

402650261 is a deficient number, since it is larger than the sum of its proper divisors (66284779).

402650261 is a wasteful number, since it uses less digits than its factorization.

402650261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 402650261 is about 20066.1471389004. The cubic root of 402650261 is about 738.4299931484.

The spelling of 402650261 in words is "four hundred two million, six hundred fifty thousand, two hundred sixty-one".