381998380 has 12 divisors (see below), whose sum is σ = 802196640. Its totient is φ = 152799344.

The previous prime is 381998371. The next prime is 381998447. The reversal of 381998380 is 83899183.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9549940 + ... + 9549979.

It is an arithmetic number, because the mean of its divisors is an integer number (66849720).

Almost surely, 2^381998380 is an apocalyptic number.

It is an amenable number.

381998380 is an abundant number, since it is smaller than the sum of its proper divisors (420198260).

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

381998380 is a wasteful number, since it uses less digits than its factorization.

381998380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19099928 (or 19099926 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 381998380 is about 19544.7788424428. The cubic root of 381998380 is about 725.5831249948.

The spelling of 381998380 in words is "three hundred eighty-one million, nine hundred ninety-eight thousand, three hundred eighty".