25039421 has 4 divisors (see below), whose sum is σ = 27315744. Its totient is φ = 22763100.

The previous prime is 25039411. The next prime is 25039429. The reversal of 25039421 is 12493052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25039421 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 (25039429) 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, 1138145 + ... + 1138166.

It is an arithmetic number, because the mean of its divisors is an integer number (6828936).

Almost surely, 2^25039421 is an apocalyptic number.

It is an amenable number.

25039421 is a deficient number, since it is larger than the sum of its proper divisors (2276323).

25039421 is a wasteful number, since it uses less digits than its factorization.

25039421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276322.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 25039421 is about 5003.9405472088. The cubic root of 25039421 is about 292.5553833813. Note that the first 3 decimals are identical.

The spelling of 25039421 in words is "twenty-five million, thirty-nine thousand, four hundred twenty-one".