389998257 has 16 divisors (see below), whose sum is σ = 568555200. Its totient is φ = 235827200.

The previous prime is 389998253. The next prime is 389998289. The reversal of 389998257 is 752899983.

It is a cyclic number.

It is not a de Polignac number, because 389998257 - 2² = 389998253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 389998257.

It is not an unprimeable number, because it can be changed into a prime (389998253) 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, 1657 + ... + 27977.

It is an arithmetic number, because the mean of its divisors is an integer number (35534700).

Almost surely, 2^389998257 is an apocalyptic number.

It is an amenable number.

389998257 is a deficient number, since it is larger than the sum of its proper divisors (178556943).

389998257 is a wasteful number, since it uses less digits than its factorization.

389998257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26784.

The product of its digits is 9797760, while the sum is 60.

The square root of 389998257 is about 19748.3735279643. The cubic root of 389998257 is about 730.6132689766.

The spelling of 389998257 in words is "three hundred eighty-nine million, nine hundred ninety-eight thousand, two hundred fifty-seven".