400387320 has 128 divisors (see below), whose sum is σ = 1377792000. Its totient is φ = 103317120.

The previous prime is 400387303. The next prime is 400387333. The reversal of 400387320 is 23783004.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27501 + ... + 39459.

It is an arithmetic number, because the mean of its divisors is an integer number (10764000).

Almost surely, 2^400387320 is an apocalyptic number.

400387320 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 400387320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (688896000).

400387320 is an abundant number, since it is smaller than the sum of its proper divisors (977404680).

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

400387320 is a wasteful number, since it uses less digits than its factorization.

400387320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12010 (or 12000 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 400387320 is about 20009.6806571219. The cubic root of 400387320 is about 737.0440395234.

The spelling of 400387320 in words is "four hundred million, three hundred eighty-seven thousand, three hundred twenty".