25198257 has 16 divisors (see below), whose sum is σ = 39636992. Its totient is φ = 13934160.

The previous prime is 25198249. The next prime is 25198279. The reversal of 25198257 is 75289152.

It is not a de Polignac number, because 25198257 - 2³ = 25198249 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25198297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18703 + ... + 20004.

It is an arithmetic number, because the mean of its divisors is an integer number (2477312).

Almost surely, 2^25198257 is an apocalyptic number.

It is an amenable number.

25198257 is a deficient number, since it is larger than the sum of its proper divisors (14438735).

25198257 is a wasteful number, since it uses less digits than its factorization.

25198257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38748.

The product of its digits is 50400, while the sum is 39.

The square root of 25198257 is about 5019.7865492469. The cubic root of 25198257 is about 293.1726822049.

The spelling of 25198257 in words is "twenty-five million, one hundred ninety-eight thousand, two hundred fifty-seven".