381997320 has 64 divisors (see below), whose sum is σ = 1161717120. Its totient is φ = 100468224.

The previous prime is 381997289. The next prime is 381997339. The reversal of 381997320 is 23799183.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13044 + ... + 30563.

It is an arithmetic number, because the mean of its divisors is an integer number (18151830).

Almost surely, 2^381997320 is an apocalyptic number.

381997320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

381997320 is an abundant number, since it is smaller than the sum of its proper divisors (779719800).

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

381997320 is a wasteful number, since it uses less digits than its factorization.

381997320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43694 (or 43690 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 381997320 is about 19544.7517252075. The cubic root of 381997320 is about 725.5824538586.

The spelling of 381997320 in words is "three hundred eighty-one million, nine hundred ninety-seven thousand, three hundred twenty".