25917389 has 4 divisors (see below), whose sum is σ = 27044256. Its totient is φ = 24790524.

The previous prime is 25917383. The next prime is 25917421. The reversal of 25917389 is 98371952.

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 25917389 - 2⁴ = 25917373 is a prime.

It is a super-2 number, since 2×25917389² = 1343422105154642, 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 (25917383) 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, 563399 + ... + 563444.

It is an arithmetic number, because the mean of its divisors is an integer number (6761064).

Almost surely, 2^25917389 is an apocalyptic number.

It is an amenable number.

25917389 is a deficient number, since it is larger than the sum of its proper divisors (1126867).

25917389 is a wasteful number, since it uses less digits than its factorization.

25917389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126866.

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

The square root of 25917389 is about 5090.9123936678. The cubic root of 25917389 is about 295.9355114259.

The spelling of 25917389 in words is "twenty-five million, nine hundred seventeen thousand, three hundred eighty-nine".