402661865 has 8 divisors (see below), whose sum is σ = 487710720. Its totient is φ = 319118512.

The previous prime is 402661859. The next prime is 402661871. The reversal of 402661865 is 568166204.

It is an interprime number because it is at equal distance from previous prime (402661859) and next prime (402661871).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402661865 - 2¹² = 402657769 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375785 + ... + 376854.

It is an arithmetic number, because the mean of its divisors is an integer number (60963840).

Almost surely, 2^402661865 is an apocalyptic number.

It is an amenable number.

402661865 is a deficient number, since it is larger than the sum of its proper divisors (85048855).

402661865 is a wasteful number, since it uses less digits than its factorization.

402661865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752751.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 402661865 is about 20066.4362805158. The cubic root of 402661865 is about 738.4370866984.

The spelling of 402661865 in words is "four hundred two million, six hundred sixty-one thousand, eight hundred sixty-five".