396521860 has 48 divisors (see below), whose sum is σ = 953003520. Its totient is φ = 135757440.

The previous prime is 396521857. The next prime is 396521891. The reversal of 396521860 is 68125693.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125986 + ... + 129094.

It is an arithmetic number, because the mean of its divisors is an integer number (19854240).

Almost surely, 2^396521860 is an apocalyptic number.

It is an amenable number.

396521860 is an abundant number, since it is smaller than the sum of its proper divisors (556481660).

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

396521860 is a wasteful number, since it uses less digits than its factorization.

396521860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4036 (or 4034 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 396521860 is about 19912.8566509178. The cubic root of 396521860 is about 734.6644835134.

The spelling of 396521860 in words is "three hundred ninety-six million, five hundred twenty-one thousand, eight hundred sixty".