400424320 has 32 divisors (see below), whose sum is σ = 957265920. Its totient is φ = 160169472.

The previous prime is 400424317. The next prime is 400424351. The reversal of 400424320 is 23424004.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312192 + ... + 313471.

It is an arithmetic number, because the mean of its divisors is an integer number (29914560).

Almost surely, 2^400424320 is an apocalyptic number.

400424320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400424320 is an abundant number, since it is smaller than the sum of its proper divisors (556841600).

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

400424320 is an equidigital number, since it uses as much as digits as its factorization.

400424320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625682 (or 625670 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 400424320 is about 20010.6051882496. The cubic root of 400424320 is about 737.0667423648.

Adding to 400424320 its reverse (23424004), we get a palindrome (423848324).

The spelling of 400424320 in words is "four hundred million, four hundred twenty-four thousand, three hundred twenty".