400831 has 4 divisors (see below), whose sum is σ = 407464. Its totient is φ = 394200.

The previous prime is 400823. The next prime is 400837. The reversal of 400831 is 138004.

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

It is a cyclic number.

It is not a de Polignac number, because 400831 - 2³ = 400823 is a prime.

It is a super-2 number, since 2×400831² = 321330981122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 3225 + ... + 3346.

It is an arithmetic number, because the mean of its divisors is an integer number (101866).

2⁴⁰⁰⁸³¹ is an apocalyptic number.

400831 is a deficient number, since it is larger than the sum of its proper divisors (6633).

400831 is an equidigital number, since it uses as much as digits as its factorization.

400831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6632.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 400831 is about 633.1121543613. The cubic root of 400831 is about 73.7316185158.

Adding to 400831 its reverse (138004), we get a palindrome (538835).

The spelling of 400831 in words is "four hundred thousand, eight hundred thirty-one".