400631042 has 64 divisors (see below), whose sum is σ = 741857280. Its totient is φ = 158630400.

The previous prime is 400631029. The next prime is 400631047. The reversal of 400631042 is 240136004.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (400631047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 979334 + ... + 979742.

It is an arithmetic number, because the mean of its divisors is an integer number (11591520).

Almost surely, 2^400631042 is an apocalyptic number.

400631042 is a deficient number, since it is larger than the sum of its proper divisors (341226238).

400631042 is a wasteful number, since it uses less digits than its factorization.

400631042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 400631042 is about 20015.7698328093. The cubic root of 400631042 is about 737.1935592527.

Adding to 400631042 its reverse (240136004), we get a palindrome (640767046).

The spelling of 400631042 in words is "four hundred million, six hundred thirty-one thousand, forty-two".