400899 has 4 divisors (see below), whose sum is σ = 534536. Its totient is φ = 267264.

The previous prime is 400871. The next prime is 400903. The reversal of 400899 is 998004.

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

It is not a de Polignac number, because 400899 - 2⁸ = 400643 is a prime.

It is a D-number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (400849) 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, 66814 + ... + 66819.

It is an arithmetic number, because the mean of its divisors is an integer number (133634).

2⁴⁰⁰⁸⁹⁹ is an apocalyptic number.

400899 is a deficient number, since it is larger than the sum of its proper divisors (133637).

400899 is a wasteful number, since it uses less digits than its factorization.

400899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133636.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 400899 is about 633.1658550491. The cubic root of 400899 is about 73.7357877430.

The spelling of 400899 in words is "four hundred thousand, eight hundred ninety-nine".