381311772 has 12 divisors (see below), whose sum is σ = 889727496. Its totient is φ = 127103920.

The previous prime is 381311759. The next prime is 381311773. The reversal of 381311772 is 277113183.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381311773) 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, 15887979 + ... + 15888002.

It is an arithmetic number, because the mean of its divisors is an integer number (74143958).

Almost surely, 2^381311772 is an apocalyptic number.

It is an amenable number.

381311772 is an abundant number, since it is smaller than the sum of its proper divisors (508415724).

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

381311772 is a wasteful number, since it uses less digits than its factorization.

381311772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31775988 (or 31775986 counting only the distinct ones).

The product of its digits is 7056, while the sum is 33.

The square root of 381311772 is about 19527.2059445278. The cubic root of 381311772 is about 725.1481406357.

It can be divided in two parts, 38131 and 1772, that added together give a triangular number (39903 = T₂₈₂).

The spelling of 381311772 in words is "three hundred eighty-one million, three hundred eleven thousand, seven hundred seventy-two".