257398125 has 20 divisors (see below), whose sum is σ = 428862720. Its totient is φ = 137278000.

The previous prime is 257398103. The next prime is 257398147. The reversal of 257398125 is 521893752.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (257398103) and next prime (257398147).

It is not a de Polignac number, because 257398125 - 2¹⁵ = 257365357 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 66765 + ... + 70514.

It is an arithmetic number, because the mean of its divisors is an integer number (21443136).

Almost surely, 2^257398125 is an apocalyptic number.

257398125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

257398125 is a deficient number, since it is larger than the sum of its proper divisors (171464595).

257398125 is an equidigital number, since it uses as much as digits as its factorization.

257398125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137302 (or 137287 counting only the distinct ones).

The product of its digits is 151200, while the sum is 42.

The square root of 257398125 is about 16043.6319142518. The cubic root of 257398125 is about 636.1142525449.

The spelling of 257398125 in words is "two hundred fifty-seven million, three hundred ninety-eight thousand, one hundred twenty-five".