381326638 has 32 divisors (see below), whose sum is σ = 714290688. Its totient is φ = 148327200.

The previous prime is 381326563. The next prime is 381326653. The reversal of 381326638 is 836623183.

It is a self number, because there is not a number n which added to its sum of digits gives 381326638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114943 + ... + 118213.

It is an arithmetic number, because the mean of its divisors is an integer number (22321584).

Almost surely, 2^381326638 is an apocalyptic number.

381326638 is a deficient number, since it is larger than the sum of its proper divisors (332964050).

381326638 is a wasteful number, since it uses less digits than its factorization.

381326638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048.

The product of its digits is 124416, while the sum is 40.

The square root of 381326638 is about 19527.5865892332. The cubic root of 381326638 is about 725.1575641687.

The spelling of 381326638 in words is "three hundred eighty-one million, three hundred twenty-six thousand, six hundred thirty-eight".