25999997 has 8 divisors (see below), whose sum is σ = 26365176. Its totient is φ = 25637632.

The previous prime is 25999949. The next prime is 26000003. The reversal of 25999997 is 79999952.

It can be written as a sum of positive squares in 4 ways, for example, as 7458361 + 18541636 = 2731^2 + 4306^2 .

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

It is not a de Polignac number, because 25999997 - 2⁶ = 25999933 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 (25990997) 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, 23153 + ... + 24249.

It is an arithmetic number, because the mean of its divisors is an integer number (3295647).

Almost surely, 2^25999997 is an apocalyptic number.

It is an amenable number.

25999997 is a deficient number, since it is larger than the sum of its proper divisors (365179).

25999997 is a wasteful number, since it uses less digits than its factorization.

25999997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407.

The product of its digits is 4133430, while the sum is 59.

The square root of 25999997 is about 5099.0192194186. The cubic root of 25999997 is about 296.2495954465.

The spelling of 25999997 in words is "twenty-five million, nine hundred ninety-nine thousand, nine hundred ninety-seven".