400940 has 12 divisors (see below), whose sum is σ = 842016. Its totient is φ = 160368.

The previous prime is 400931. The next prime is 400943. The reversal of 400940 is 49004.

It is not an unprimeable number, because it can be changed into a prime (400943) 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, 10004 + ... + 10043.

It is an arithmetic number, because the mean of its divisors is an integer number (70168).

2⁴⁰⁰⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

400940 is an abundant number, since it is smaller than the sum of its proper divisors (441076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400940 is a wasteful number, since it uses less digits than its factorization.

400940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20056 (or 20054 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 400940 is about 633.1982312041. The cubic root of 400940 is about 73.7383013140.

Adding to 400940 its reverse (49004), we get a palindrome (449944).

The spelling of 400940 in words is "four hundred thousand, nine hundred forty".