25725439 has 4 divisors (see below), whose sum is σ = 25743424. Its totient is φ = 25707456.

The previous prime is 25725379. The next prime is 25725451. The reversal of 25725439 is 93452752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25725439 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 25725398 and 25725407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25725499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6642 + ... + 9775.

It is an arithmetic number, because the mean of its divisors is an integer number (6435856).

Almost surely, 2^25725439 is an apocalyptic number.

25725439 is a deficient number, since it is larger than the sum of its proper divisors (17985).

25725439 is a wasteful number, since it uses less digits than its factorization.

25725439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17984.

The product of its digits is 75600, while the sum is 37.

The square root of 25725439 is about 5072.0251379503. The cubic root of 25725439 is about 295.2031120612.

The spelling of 25725439 in words is "twenty-five million, seven hundred twenty-five thousand, four hundred thirty-nine".