25472639 has 2 divisors, whose sum is σ = 25472640. Its totient is φ = 25472638.

The previous prime is 25472633. The next prime is 25472651. The reversal of 25472639 is 93627452.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25472639 is a prime.

It is a super-3 number, since 3×25472639³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25472633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12736319 + 12736320.

It is an arithmetic number, because the mean of its divisors is an integer number (12736320).

Almost surely, 2^25472639 is an apocalyptic number.

25472639 is a deficient number, since it is larger than the sum of its proper divisors (1).

25472639 is an equidigital number, since it uses as much as digits as its factorization.

25472639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 38.

The square root of 25472639 is about 5047.0425993843. The cubic root of 25472639 is about 294.2329551071.

The spelling of 25472639 in words is "twenty-five million, four hundred seventy-two thousand, six hundred thirty-nine".