381831280 has 40 divisors (see below), whose sum is σ = 926360352. Its totient is φ = 146091264.

The previous prime is 381831227. The next prime is 381831299. The reversal of 381831280 is 82138183.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 101919 + ... + 105598.

Almost surely, 2^381831280 is an apocalyptic number.

It is an amenable number.

381831280 is an abundant number, since it is smaller than the sum of its proper divisors (544529072).

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

381831280 is a wasteful number, since it uses less digits than its factorization.

381831280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207553 (or 207547 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 381831280 is about 19540.5035759061. The cubic root of 381831280 is about 725.4773107385.

The spelling of 381831280 in words is "three hundred eighty-one million, eight hundred thirty-one thousand, two hundred eighty".