25253809 has 16 divisors (see below), whose sum is σ = 30827520. Its totient is φ = 20220480.

The previous prime is 25253807. The next prime is 25253821. The reversal of 25253809 is 90835252.

It is not a de Polignac number, because 25253809 - 2¹ = 25253807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25253801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4287 + ... + 8299.

It is an arithmetic number, because the mean of its divisors is an integer number (1926720).

Almost surely, 2^25253809 is an apocalyptic number.

25253809 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

25253809 is a deficient number, since it is larger than the sum of its proper divisors (5573711).

25253809 is a wasteful number, since it uses less digits than its factorization.

25253809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4080.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 25253809 is about 5025.3168059337. The cubic root of 25253809 is about 293.3879666088.

It can be divided in two parts, 25253 and 809, that added together give a palindrome (26062).

The spelling of 25253809 in words is "twenty-five million, two hundred fifty-three thousand, eight hundred nine".