257039989 has 4 divisors (see below), whose sum is σ = 258258400. Its totient is φ = 255821580.

The previous prime is 257039971. The next prime is 257040013. The reversal of 257039989 is 989930752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 257039989 - 2⁵ = 257039957 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 (257039689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608889 + ... + 609310.

It is an arithmetic number, because the mean of its divisors is an integer number (64564600).

Almost surely, 2^257039989 is an apocalyptic number.

It is an amenable number.

257039989 is a deficient number, since it is larger than the sum of its proper divisors (1218411).

257039989 is a wasteful number, since it uses less digits than its factorization.

257039989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218410.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The square root of 257039989 is about 16032.4667160110. The cubic root of 257039989 is about 635.8190922050.

The spelling of 257039989 in words is "two hundred fifty-seven million, thirty-nine thousand, nine hundred eighty-nine".