387389331 has 16 divisors (see below), whose sum is σ = 655897600. Its totient is φ = 221365224.

The previous prime is 387389329. The next prime is 387389357. The reversal of 387389331 is 133983783.

It is not a de Polignac number, because 387389331 - 2¹ = 387389329 is a prime.

It is a super-2 number, since 2×387389331² = 300140987545255122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387389381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1024651 + ... + 1025028.

It is an arithmetic number, because the mean of its divisors is an integer number (40993600).

Almost surely, 2^387389331 is an apocalyptic number.

387389331 is a deficient number, since it is larger than the sum of its proper divisors (268508269).

387389331 is a wasteful number, since it uses less digits than its factorization.

387389331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049695 (or 2049689 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 387389331 is about 19682.2084888866. The cubic root of 387389331 is about 728.9804563847.

The spelling of 387389331 in words is "three hundred eighty-seven million, three hundred eighty-nine thousand, three hundred thirty-one".