25397817 has 4 divisors (see below), whose sum is σ = 33863760. Its totient is φ = 16931876.

The previous prime is 25397797. The next prime is 25397833. The reversal of 25397817 is 71879352.

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 25397817 - 2⁶ = 25397753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25397837) 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, 4232967 + ... + 4232972.

It is an arithmetic number, because the mean of its divisors is an integer number (8465940).

Almost surely, 2^25397817 is an apocalyptic number.

It is an amenable number.

25397817 is a deficient number, since it is larger than the sum of its proper divisors (8465943).

25397817 is an equidigital number, since it uses as much as digits as its factorization.

25397817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8465942.

The product of its digits is 105840, while the sum is 42.

The square root of 25397817 is about 5039.6246884069. The cubic root of 25397817 is about 293.9445844002.

The spelling of 25397817 in words is "twenty-five million, three hundred ninety-seven thousand, eight hundred seventeen".