25198397 has 12 divisors (see below), whose sum is σ = 29729376. Its totient is φ = 21291480.

The previous prime is 25198379. The next prime is 25198399. The reversal of 25198397 is 79389152.

It is a de Polignac number, because none of the positive numbers 2^k-25198397 is a prime.

It is a super-2 number, since 2×25198397² = 1269918422739218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25198399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143 + ... + 7100.

It is an arithmetic number, because the mean of its divisors is an integer number (2477448).

Almost surely, 2^25198397 is an apocalyptic number.

It is an amenable number.

25198397 is a deficient number, since it is larger than the sum of its proper divisors (4530979).

25198397 is an equidigital number, since it uses as much as digits as its factorization.

25198397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7328 (or 7321 counting only the distinct ones).

The product of its digits is 136080, while the sum is 44.

The square root of 25198397 is about 5019.8004940436. The cubic root of 25198397 is about 293.1732251538.

The spelling of 25198397 in words is "twenty-five million, one hundred ninety-eight thousand, three hundred ninety-seven".