381978938 has 8 divisors (see below), whose sum is σ = 625056480. Its totient is φ = 173626780.

The previous prime is 381978929. The next prime is 381978991. The reversal of 381978938 is 839879183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon 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 in 3 ways as a sum of consecutive naturals, for example, 8681318 + ... + 8681361.

It is an arithmetic number, because the mean of its divisors is an integer number (78132060).

Almost surely, 2^381978938 is an apocalyptic number.

381978938 is a deficient number, since it is larger than the sum of its proper divisors (243077542).

381978938 is a wasteful number, since it uses less digits than its factorization.

381978938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17362692.

The product of its digits is 2612736, while the sum is 56.

The square root of 381978938 is about 19544.2814654313. The cubic root of 381978938 is about 725.5708151464.

The spelling of 381978938 in words is "three hundred eighty-one million, nine hundred seventy-eight thousand, nine hundred thirty-eight".