257447425 has 6 divisors (see below), whose sum is σ = 319234838. Its totient is φ = 205957920.

The previous prime is 257447419. The next prime is 257447431. The reversal of 257447425 is 524744752.

It is an interprime number because it is at equal distance from previous prime (257447419) and next prime (257447431).

It can be written as a sum of positive squares in 3 ways, for example, as 51036736 + 206410689 = 7144^2 + 14367^2 .

It is not a de Polignac number, because 257447425 - 2³ = 257447417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5148924 + ... + 5148973.

Almost surely, 2^257447425 is an apocalyptic number.

257447425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

257447425 is a deficient number, since it is larger than the sum of its proper divisors (61787413).

257447425 is a wasteful number, since it uses less digits than its factorization.

257447425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10297907 (or 10297902 counting only the distinct ones).

The product of its digits is 313600, while the sum is 40.

The square root of 257447425 is about 16045.1682758393. The cubic root of 257447425 is about 636.1548620490.

The spelling of 257447425 in words is "two hundred fifty-seven million, four hundred forty-seven thousand, four hundred twenty-five".