400790 has 16 divisors (see below), whose sum is σ = 777168. Its totient is φ = 147936.

The previous prime is 400759. The next prime is 400823. The reversal of 400790 is 97004.

400790 = 61² + 62² + ... + 112².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1412 + ... + 1671.

It is an arithmetic number, because the mean of its divisors is an integer number (48573).

2⁴⁰⁰⁷⁹⁰ is an apocalyptic number.

400790 is a deficient number, since it is larger than the sum of its proper divisors (376378).

400790 is a wasteful number, since it uses less digits than its factorization.

400790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 400790 is about 633.0797738042. The cubic root of 400790 is about 73.7291044891.

Adding to 400790 its reverse (97004), we get a palindrome (497794).

The spelling of 400790 in words is "four hundred thousand, seven hundred ninety".