400831982 has 16 divisors (see below), whose sum is σ = 617947440. Its totient is φ = 194890752.

The previous prime is 400831979. The next prime is 400831993. The reversal of 400831982 is 289138004.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 9518 + ... + 29870.

It is an arithmetic number, because the mean of its divisors is an integer number (38621715).

Almost surely, 2^400831982 is an apocalyptic number.

400831982 is a deficient number, since it is larger than the sum of its proper divisors (217115458).

400831982 is a wasteful number, since it uses less digits than its factorization.

400831982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20627.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 400831982 is about 20020.7887457013. The cubic root of 400831982 is about 737.3167872768.

Adding to 400831982 its reverse (289138004), we get a palindrome (689969986).

The spelling of 400831982 in words is "four hundred million, eight hundred thirty-one thousand, nine hundred eighty-two".