400531164 has 48 divisors (see below), whose sum is σ = 1033917696. Its totient is φ = 119660800.

The previous prime is 400531121. The next prime is 400531181. The reversal of 400531164 is 461135004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11997 + ... + 30740.

It is an arithmetic number, because the mean of its divisors is an integer number (21539952).

Almost surely, 2^400531164 is an apocalyptic number.

400531164 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

400531164 is an abundant number, since it is smaller than the sum of its proper divisors (633386532).

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

400531164 is a wasteful number, since it uses less digits than its factorization.

400531164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42826 (or 42824 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 400531164 is about 20013.2746945621. The cubic root of 400531164 is about 737.1322929586.

Adding to 400531164 its reverse (461135004), we get a palindrome (861666168).

The spelling of 400531164 in words is "four hundred million, five hundred thirty-one thousand, one hundred sixty-four".