381307928 has 8 divisors (see below), whose sum is σ = 714952380. Its totient is φ = 190653960.

The previous prime is 381307907. The next prime is 381307931. The reversal of 381307928 is 829703183.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

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 as a sum of consecutive naturals, namely, 23831738 + ... + 23831753.

Almost surely, 2^381307928 is an apocalyptic number.

It is an amenable number.

381307928 is a deficient number, since it is larger than the sum of its proper divisors (333644452).

381307928 is a wasteful number, since it uses less digits than its factorization.

381307928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47663497 (or 47663493 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 381307928 is about 19527.1075174999. The cubic root of 381307928 is about 725.1457038906.

The spelling of 381307928 in words is "three hundred eighty-one million, three hundred seven thousand, nine hundred twenty-eight".