389256991 has 8 divisors (see below), whose sum is σ = 406410624. Its totient is φ = 372122520.

The previous prime is 389256977. The next prime is 389256997. The reversal of 389256991 is 199652983.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 389256991 - 2⁹ = 389256479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389256997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50376 + ... + 57586.

It is an arithmetic number, because the mean of its divisors is an integer number (50801328).

Almost surely, 2^389256991 is an apocalyptic number.

389256991 is a deficient number, since it is larger than the sum of its proper divisors (17153633).

389256991 is a wasteful number, since it uses less digits than its factorization.

389256991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9581.

The product of its digits is 1049760, while the sum is 52.

The square root of 389256991 is about 19729.5968281159. The cubic root of 389256991 is about 730.1500854854.

The spelling of 389256991 in words is "three hundred eighty-nine million, two hundred fifty-six thousand, nine hundred ninety-one".