400939 has 16 divisors (see below), whose sum is σ = 516096. Its totient is φ = 302400.

The previous prime is 400931. The next prime is 400943. The reversal of 400939 is 939004.

400939 = T₇ + T₈ + ... + T₁₃₃.

It is not a de Polignac number, because 400939 - 2³ = 400931 is a prime.

400939 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (400931) 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, 3094 + ... + 3220.

It is an arithmetic number, because the mean of its divisors is an integer number (32256).

2⁴⁰⁰⁹³⁹ is an apocalyptic number.

400939 is a deficient number, since it is larger than the sum of its proper divisors (115157).

400939 is a wasteful number, since it uses less digits than its factorization.

400939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 400939 is about 633.1974415615. The cubic root of 400939 is about 73.7382400094.

The spelling of 400939 in words is "four hundred thousand, nine hundred thirty-nine".