25320249 has 32 divisors (see below), whose sum is σ = 38924160. Its totient is φ = 16257024.

The previous prime is 25320241. The next prime is 25320283. The reversal of 25320249 is 94202352.

It is not a de Polignac number, because 25320249 - 2³ = 25320241 is a prime.

It is a super-2 number, since 2×25320249² = 1282230018844002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (25320241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131097 + ... + 131289.

It is an arithmetic number, because the mean of its divisors is an integer number (1216380).

Almost surely, 2^25320249 is an apocalyptic number.

It is an amenable number.

25320249 is a deficient number, since it is larger than the sum of its proper divisors (13603911).

25320249 is a wasteful number, since it uses less digits than its factorization.

25320249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 25320249 is about 5031.9229922565. The cubic root of 25320249 is about 293.6450318178.

It can be divided in two parts, 253 and 20249, that added together give a palindrome (20502).

The spelling of 25320249 in words is "twenty-five million, three hundred twenty thousand, two hundred forty-nine".