25648399 has 4 divisors (see below), whose sum is σ = 29312464. Its totient is φ = 21984336.

The previous prime is 25648397. The next prime is 25648409. The reversal of 25648399 is 99384652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25648399 - 2¹ = 25648397 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 (25648391) 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, 1832022 + ... + 1832035.

It is an arithmetic number, because the mean of its divisors is an integer number (7328116).

Almost surely, 2^25648399 is an apocalyptic number.

25648399 is a deficient number, since it is larger than the sum of its proper divisors (3664065).

25648399 is an equidigital number, since it uses as much as digits as its factorization.

25648399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3664064.

The product of its digits is 466560, while the sum is 46.

The square root of 25648399 is about 5064.4248439482. The cubic root of 25648399 is about 294.9081357166.

The spelling of 25648399 in words is "twenty-five million, six hundred forty-eight thousand, three hundred ninety-nine".