381980646 has 48 divisors (see below), whose sum is σ = 846106560. Its totient is φ = 124500480.

The previous prime is 381980611. The next prime is 381980671. The reversal of 381980646 is 646089183.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 410710 + ... + 411638.

It is an arithmetic number, because the mean of its divisors is an integer number (17627220).

Almost surely, 2^381980646 is an apocalyptic number.

381980646 is an abundant number, since it is smaller than the sum of its proper divisors (464125914).

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

381980646 is a wasteful number, since it uses less digits than its factorization.

381980646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421 (or 1418 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 381980646 is about 19544.3251610282. The cubic root of 381980646 is about 725.5718965961.

The spelling of 381980646 in words is "three hundred eighty-one million, nine hundred eighty thousand, six hundred forty-six".