396731520 has 192 divisors, whose sum is σ = 1421259840. Its totient is φ = 105753600.

The previous prime is 396731509. The next prime is 396731527. The reversal of 396731520 is 25137693.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (396731527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154245 + ... + 156795.

It is an arithmetic number, because the mean of its divisors is an integer number (7402395).

Almost surely, 2^396731520 is an apocalyptic number.

396731520 is a gapful number since it is divisible by the number (30) 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 396731520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (710629920).

396731520 is an abundant number, since it is smaller than the sum of its proper divisors (1024528320).

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

396731520 is an equidigital number, since it uses as much as digits as its factorization.

396731520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2585 (or 2561 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 396731520 is about 19918.1203932500. The cubic root of 396731520 is about 734.7939447373.

The spelling of 396731520 in words is "three hundred ninety-six million, seven hundred thirty-one thousand, five hundred twenty".