400887 has 6 divisors (see below), whose sum is σ = 579072. Its totient is φ = 267252.

The previous prime is 400871. The next prime is 400903. The reversal of 400887 is 788004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (400871) and next prime (400903).

It is not a de Polignac number, because 400887 - 2⁴ = 400871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400887.

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 400887.

It is not an unprimeable number, because it can be changed into a prime (400837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22263 + ... + 22280.

It is an arithmetic number, because the mean of its divisors is an integer number (96512).

2⁴⁰⁰⁸⁸⁷ is an apocalyptic number.

400887 is a deficient number, since it is larger than the sum of its proper divisors (178185).

400887 is a wasteful number, since it uses less digits than its factorization.

400887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44549 (or 44546 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 400887 is about 633.1563787881. The cubic root of 400887 is about 73.7350520313.

It can be divided in two parts, 4008 and 87, that added together give a triangular number (4095 = T₉₀).

The spelling of 400887 in words is "four hundred thousand, eight hundred eighty-seven".