25440231 has 16 divisors (see below), whose sum is σ = 35513856. Its totient is φ = 16168416.

The previous prime is 25440229. The next prime is 25440241. The reversal of 25440231 is 13204452.

It is not a de Polignac number, because 25440231 - 2¹ = 25440229 is a prime.

It is a super-2 number, since 2×25440231² = 1294410706666722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25440198 and 25440207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25440241) 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, 34341 + ... + 35073.

It is an arithmetic number, because the mean of its divisors is an integer number (2219616).

Almost surely, 2^25440231 is an apocalyptic number.

25440231 is a deficient number, since it is larger than the sum of its proper divisors (10073625).

25440231 is a wasteful number, since it uses less digits than its factorization.

25440231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 25440231 is about 5043.8309844800. The cubic root of 25440231 is about 294.1081211840.

Adding to 25440231 its reverse (13204452), we get a palindrome (38644683).

The spelling of 25440231 in words is "twenty-five million, four hundred forty thousand, two hundred thirty-one".