257863489 has 4 divisors (see below), whose sum is σ = 277699156. Its totient is φ = 238027824.

The previous prime is 257863483. The next prime is 257863513. The reversal of 257863489 is 984368752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83174400 + 174689089 = 9120^2 + 13217^2 .

It is a cyclic number.

It is not a de Polignac number, because 257863489 - 2³ = 257863481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257863481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9917814 + ... + 9917839.

It is an arithmetic number, because the mean of its divisors is an integer number (69424789).

Almost surely, 2^257863489 is an apocalyptic number.

It is an amenable number.

257863489 is a deficient number, since it is larger than the sum of its proper divisors (19835667).

257863489 is a wasteful number, since it uses less digits than its factorization.

257863489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19835666.

The product of its digits is 2903040, while the sum is 52.

The square root of 257863489 is about 16058.1284401390. The cubic root of 257863489 is about 636.4973768746.

The spelling of 257863489 in words is "two hundred fifty-seven million, eight hundred sixty-three thousand, four hundred eighty-nine".