25918997 has 8 divisors (see below), whose sum is σ = 28102200. Its totient is φ = 23762880.

The previous prime is 25918993. The next prime is 25919053. The reversal of 25918997 is 79981952.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1406596 + 24512401 = 1186^2 + 4951^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25918997 - 2² = 25918993 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 (25918993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4754 + ... + 8627.

It is an arithmetic number, because the mean of its divisors is an integer number (3512775).

Almost surely, 2^25918997 is an apocalyptic number.

It is an amenable number.

25918997 is a deficient number, since it is larger than the sum of its proper divisors (2183203).

25918997 is a wasteful number, since it uses less digits than its factorization.

25918997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13543.

The product of its digits is 408240, while the sum is 50.

The square root of 25918997 is about 5091.0703196872. The cubic root of 25918997 is about 295.9416315699.

The spelling of 25918997 in words is "twenty-five million, nine hundred eighteen thousand, nine hundred ninety-seven".