400287 has 16 divisors (see below), whose sum is σ = 570240. Its totient is φ = 249312.

The previous prime is 400277. The next prime is 400291. The reversal of 400287 is 782004.

It is a happy number.

It is not a de Polignac number, because 400287 - 2⁸ = 400031 is a prime.

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 400287.

It is not an unprimeable number, because it can be changed into a prime (400207) 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, 3688 + ... + 3794.

It is an arithmetic number, because the mean of its divisors is an integer number (35640).

2⁴⁰⁰²⁸⁷ is an apocalyptic number.

400287 is a deficient number, since it is larger than the sum of its proper divisors (169953).

400287 is a wasteful number, since it uses less digits than its factorization.

400287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182.

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

The square root of 400287 is about 632.6823847714. The cubic root of 400287 is about 73.6982477106.

The spelling of 400287 in words is "four hundred thousand, two hundred eighty-seven".