25653997 has 8 divisors (see below), whose sum is σ = 25947576. Its totient is φ = 25362432.

The previous prime is 25653989. The next prime is 25654001. The reversal of 25653997 is 79935652.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24000201 + 1653796 = 4899^2 + 1286^2 .

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 25653997 - 2³ = 25653989 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 (25653917) 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, 44173 + ... + 44749.

It is an arithmetic number, because the mean of its divisors is an integer number (3243447).

Almost surely, 2^25653997 is an apocalyptic number.

It is an amenable number.

25653997 is a deficient number, since it is larger than the sum of its proper divisors (293579).

25653997 is a wasteful number, since it uses less digits than its factorization.

25653997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007.

The product of its digits is 510300, while the sum is 46.

The square root of 25653997 is about 5064.9774925462. The cubic root of 25653997 is about 294.9295896308.

The spelling of 25653997 in words is "twenty-five million, six hundred fifty-three thousand, nine hundred ninety-seven".