400801864 has 16 divisors (see below), whose sum is σ = 784177920. Its totient is φ = 191687760.

The previous prime is 400801763. The next prime is 400801873. The reversal of 400801864 is 468108004.

It is an unprimeable number.

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, 1088952 + ... + 1089319.

It is an arithmetic number, because the mean of its divisors is an integer number (49011120).

Almost surely, 2^400801864 is an apocalyptic number.

It is an amenable number.

400801864 is a deficient number, since it is larger than the sum of its proper divisors (383376056).

400801864 is a wasteful number, since it uses less digits than its factorization.

400801864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178300 (or 2178296 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 400801864 is about 20020.0365634032. The cubic root of 400801864 is about 737.2983198023.

Adding to 400801864 its reverse (468108004), we get a palindrome (868909868).

The spelling of 400801864 in words is "four hundred million, eight hundred one thousand, eight hundred sixty-four".