396721384 has 32 divisors (see below), whose sum is σ = 813024000. Its totient is φ = 180668160.

The previous prime is 396721361. The next prime is 396721393. The reversal of 396721384 is 483127693.

It is a self number, because there is not a number n which added to its sum of digits gives 396721384.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42834 + ... + 51265.

It is an arithmetic number, because the mean of its divisors is an integer number (25407000).

Almost surely, 2^396721384 is an apocalyptic number.

396721384 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

396721384 is an abundant number, since it is smaller than the sum of its proper divisors (416302616).

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

396721384 is a wasteful number, since it uses less digits than its factorization.

396721384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94153 (or 94149 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 396721384 is about 19917.8659499455. The cubic root of 396721384 is about 734.7876869917.

The spelling of 396721384 in words is "three hundred ninety-six million, seven hundred twenty-one thousand, three hundred eighty-four".