402688087 has 4 divisors (see below), whose sum is σ = 403983216. Its totient is φ = 401392960.

The previous prime is 402688081. The next prime is 402688093. The reversal of 402688087 is 780886204.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (402688081) and next prime (402688093).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402688087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402688081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647098 + ... + 647719.

It is an arithmetic number, because the mean of its divisors is an integer number (100995804).

Almost surely, 2^402688087 is an apocalyptic number.

402688087 is a deficient number, since it is larger than the sum of its proper divisors (1295129).

402688087 is a wasteful number, since it uses less digits than its factorization.

402688087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295128.

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 402688087 is about 20067.0896494733. The cubic root of 402688087 is about 738.4531157612.

The spelling of 402688087 in words is "four hundred two million, six hundred eighty-eight thousand, eighty-seven".