257986899 has 6 divisors (see below), whose sum is σ = 372647756. Its totient is φ = 171991260.

The previous prime is 257986853. The next prime is 257986907. The reversal of 257986899 is 998689752.

It is not a de Polignac number, because 257986899 - 2¹¹ = 257984851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257986819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14332597 + ... + 14332614.

Almost surely, 2^257986899 is an apocalyptic number.

257986899 is a deficient number, since it is larger than the sum of its proper divisors (114660857).

257986899 is a wasteful number, since it uses less digits than its factorization.

257986899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28665217 (or 28665214 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 63.

The square root of 257986899 is about 16061.9705827149. The cubic root of 257986899 is about 636.5989003769.

The spelling of 257986899 in words is "two hundred fifty-seven million, nine hundred eighty-six thousand, eight hundred ninety-nine".