389657091 has 16 divisors (see below), whose sum is σ = 525869568. Its totient is φ = 256620000.

The previous prime is 389657087. The next prime is 389657117. The reversal of 389657091 is 190756983.

It is not a de Polignac number, because 389657091 - 2² = 389657087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 389657091.

It is not an unprimeable number, because it can be changed into a prime (389657291) 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, 164566 + ... + 166916.

It is an arithmetic number, because the mean of its divisors is an integer number (32866848).

Almost surely, 2^389657091 is an apocalyptic number.

389657091 is a deficient number, since it is larger than the sum of its proper divisors (136212477).

389657091 is a wasteful number, since it uses less digits than its factorization.

389657091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002.

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 389657091 is about 19739.7338127949. The cubic root of 389657091 is about 730.4001627889.

It can be divided in two parts, 38965 and 7091, that added together give a triangular number (46056 = T₃₀₃).

The spelling of 389657091 in words is "three hundred eighty-nine million, six hundred fifty-seven thousand, ninety-one".