402087 has 16 divisors (see below), whose sum is σ = 628992. Its totient is φ = 223680.

The previous prime is 402071. The next prime is 402089. The reversal of 402087 is 780204.

It is a happy number.

It is not a de Polignac number, because 402087 - 2⁴ = 402071 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

402087 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 402087.

It is not an unprimeable number, because it can be changed into a prime (402089) 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, 628 + ... + 1094.

It is an arithmetic number, because the mean of its divisors is an integer number (39312).

2⁴⁰²⁰⁸⁷ is an apocalyptic number.

402087 is a deficient number, since it is larger than the sum of its proper divisors (226905).

402087 is a wasteful number, since it uses less digits than its factorization.

402087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 402087 is about 634.1033038867. The cubic root of 402087 is about 73.8085506503.

The spelling of 402087 in words is "four hundred two thousand, eighty-seven".