25216439 has 4 divisors (see below), whose sum is σ = 26543640. Its totient is φ = 23889240.

The previous prime is 25216421. The next prime is 25216453. The reversal of 25216439 is 93461252.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 25216439 - 2⁸ = 25216183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25216409) 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, 663572 + ... + 663609.

It is an arithmetic number, because the mean of its divisors is an integer number (6635910).

Almost surely, 2^25216439 is an apocalyptic number.

25216439 is a deficient number, since it is larger than the sum of its proper divisors (1327201).

25216439 is a wasteful number, since it uses less digits than its factorization.

25216439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327200.

The product of its digits is 12960, while the sum is 32.

The square root of 25216439 is about 5021.5972558540. The cubic root of 25216439 is about 293.2431789346.

The spelling of 25216439 in words is "twenty-five million, two hundred sixteen thousand, four hundred thirty-nine".