400939520 has 80 divisors (see below), whose sum is σ = 1012033440. Its totient is φ = 151916544.

The previous prime is 400939507. The next prime is 400939531. The reversal of 400939520 is 25939004.

400939520 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 44519 + ... + 52761.

It is an arithmetic number, because the mean of its divisors is an integer number (12650418).

Almost surely, 2^400939520 is an apocalyptic number.

400939520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400939520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (506016720).

400939520 is an abundant number, since it is smaller than the sum of its proper divisors (611093920).

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

400939520 is an equidigital number, since it uses as much as digits as its factorization.

400939520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8285 (or 8269 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 400939520 is about 20023.4742240202. The cubic root of 400939520 is about 737.3827188779.

The spelling of 400939520 in words is "four hundred million, nine hundred thirty-nine thousand, five hundred twenty".