385978931 has 24 divisors (see below), whose sum is σ = 454624704. Its totient is φ = 326177280.

The previous prime is 385978921. The next prime is 385978949. The reversal of 385978931 is 139879583.

It is a happy number.

It is not a de Polignac number, because 385978931 - 2⁶ = 385978867 is a prime.

It is a super-2 number, since 2×385978931² = 297959470351805522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385978921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104486 + ... + 108116.

It is an arithmetic number, because the mean of its divisors is an integer number (18942696).

Almost surely, 2^385978931 is an apocalyptic number.

385978931 is a deficient number, since it is larger than the sum of its proper divisors (68645773).

385978931 is a wasteful number, since it uses less digits than its factorization.

385978931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3711 (or 3698 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 53.

The square root of 385978931 is about 19646.3465051393. The cubic root of 385978931 is about 728.0946943148.

The spelling of 385978931 in words is "three hundred eighty-five million, nine hundred seventy-eight thousand, nine hundred thirty-one".