402687 has 12 divisors (see below), whose sum is σ = 588744. Its totient is φ = 265200.

The previous prime is 402631. The next prime is 402691. The reversal of 402687 is 786204.

It is not a de Polignac number, because 402687 - 2⁷ = 402559 is a prime.

402687 is a lucky number.

It is a plaindrome in base 11 and base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 402687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 688 + ... + 1130.

It is an arithmetic number, because the mean of its divisors is an integer number (49062).

2⁴⁰²⁶⁸⁷ is an apocalyptic number.

402687 is a deficient number, since it is larger than the sum of its proper divisors (186057).

402687 is a wasteful number, since it uses less digits than its factorization.

402687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 402687 is about 634.5762365548. The cubic root of 402687 is about 73.8452451310.

It can be divided in two parts, 402 and 687, that added together give a square (1089 = 33²).

The spelling of 402687 in words is "four hundred two thousand, six hundred eighty-seven".