400331320 has 16 divisors (see below), whose sum is σ = 900745560. Its totient is φ = 160132512.

The previous prime is 400331279. The next prime is 400331357. The reversal of 400331320 is 23133004.

It is a junction number, because it is equal to n+sod(n) for n = 400331294 and 400331303.

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, 5004102 + ... + 5004181.

Almost surely, 2^400331320 is an apocalyptic number.

400331320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400331320 is an abundant number, since it is smaller than the sum of its proper divisors (500414240).

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

400331320 is a wasteful number, since it uses less digits than its factorization.

400331320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10008294 (or 10008290 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 400331320 is about 20008.2812855078. The cubic root of 400331320 is about 737.0096758056.

Adding to 400331320 its reverse (23133004), we get a palindrome (423464324).

The spelling of 400331320 in words is "four hundred million, three hundred thirty-one thousand, three hundred twenty".