25438397 has 4 divisors (see below), whose sum is σ = 26777280. Its totient is φ = 24099516.

The previous prime is 25438393. The next prime is 25438411. The reversal of 25438397 is 79383452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25438397 - 2² = 25438393 is a prime.

It is a super-2 number, since 2×25438397² = 1294224083859218, 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 (25438393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 669413 + ... + 669450.

It is an arithmetic number, because the mean of its divisors is an integer number (6694320).

Almost surely, 2^25438397 is an apocalyptic number.

It is an amenable number.

25438397 is a deficient number, since it is larger than the sum of its proper divisors (1338883).

25438397 is a wasteful number, since it uses less digits than its factorization.

25438397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338882.

The product of its digits is 181440, while the sum is 41.

The square root of 25438397 is about 5043.6491749526. The cubic root of 25438397 is about 294.1010535431.

The spelling of 25438397 in words is "twenty-five million, four hundred thirty-eight thousand, three hundred ninety-seven".