25798517 has 4 divisors (see below), whose sum is σ = 26235840. Its totient is φ = 25361196.

The previous prime is 25798511. The next prime is 25798567. The reversal of 25798517 is 71589752.

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 25798517 - 2¹² = 25794421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25798511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218573 + ... + 218690.

It is an arithmetic number, because the mean of its divisors is an integer number (6558960).

Almost surely, 2^25798517 is an apocalyptic number.

It is an amenable number.

25798517 is a deficient number, since it is larger than the sum of its proper divisors (437323).

25798517 is an equidigital number, since it uses as much as digits as its factorization.

25798517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437322.

The product of its digits is 176400, while the sum is 44.

The square root of 25798517 is about 5079.2240549123. The cubic root of 25798517 is about 295.4823746482.

The spelling of 25798517 in words is "twenty-five million, seven hundred ninety-eight thousand, five hundred seventeen".