381689772 has 12 divisors (see below), whose sum is σ = 890609496. Its totient is φ = 127229920.

The previous prime is 381689767. The next prime is 381689779. The reversal of 381689772 is 277986183.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (381689779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15903729 + ... + 15903752.

It is an arithmetic number, because the mean of its divisors is an integer number (74217458).

Almost surely, 2^381689772 is an apocalyptic number.

It is an amenable number.

381689772 is an abundant number, since it is smaller than the sum of its proper divisors (508919724).

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

381689772 is a wasteful number, since it uses less digits than its factorization.

381689772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31807488 (or 31807486 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 51.

The square root of 381689772 is about 19536.8823510815. The cubic root of 381689772 is about 725.3876781935.

The spelling of 381689772 in words is "three hundred eighty-one million, six hundred eighty-nine thousand, seven hundred seventy-two".