25440539 has 2 divisors, whose sum is σ = 25440540. Its totient is φ = 25440538.

The previous prime is 25440533. The next prime is 25440557. The reversal of 25440539 is 93504452.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25440539 is a prime.

It is a super-2 number, since 2×25440539² = 1294442049221042, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (25440533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12720269 + 12720270.

It is an arithmetic number, because the mean of its divisors is an integer number (12720270).

Almost surely, 2^25440539 is an apocalyptic number.

25440539 is a deficient number, since it is larger than the sum of its proper divisors (1).

25440539 is an equidigital number, since it uses as much as digits as its factorization.

25440539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 25440539 is about 5043.8615167350. The cubic root of 25440539 is about 294.1093080828.

The spelling of 25440539 in words is "twenty-five million, four hundred forty thousand, five hundred thirty-nine".