25649903 has 4 divisors (see below), whose sum is σ = 25822200. Its totient is φ = 25477608.

The previous prime is 25649881. The next prime is 25649909. The reversal of 25649903 is 30994652.

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 25649903 - 2⁶ = 25649839 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 (25649909) 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, 85925 + ... + 86222.

It is an arithmetic number, because the mean of its divisors is an integer number (6455550).

Almost surely, 2^25649903 is an apocalyptic number.

25649903 is a deficient number, since it is larger than the sum of its proper divisors (172297).

25649903 is a wasteful number, since it uses less digits than its factorization.

25649903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172296.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 25649903 is about 5064.5733285243. The cubic root of 25649903 is about 294.9138999902.

The spelling of 25649903 in words is "twenty-five million, six hundred forty-nine thousand, nine hundred three".