381940660 has 24 divisors (see below), whose sum is σ = 844290720. Its totient is φ = 144735264.

The previous prime is 381940633. The next prime is 381940693. The reversal of 381940660 is 66049183.

It is a super-2 number, since 2×381940660² = 291757335522471200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502174 + ... + 502933.

It is an arithmetic number, because the mean of its divisors is an integer number (35178780).

Almost surely, 2^381940660 is an apocalyptic number.

It is an amenable number.

381940660 is an abundant number, since it is smaller than the sum of its proper divisors (462350060).

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

381940660 is a wasteful number, since it uses less digits than its factorization.

381940660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005135 (or 1005133 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 381940660 is about 19543.3021774725. The cubic root of 381940660 is about 725.5465779222.

The spelling of 381940660 in words is "three hundred eighty-one million, nine hundred forty thousand, six hundred sixty".