25439971 has 4 divisors (see below), whose sum is σ = 25451344. Its totient is φ = 25428600.

The previous prime is 25439969. The next prime is 25440011. The reversal of 25439971 is 17993452.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25439971 - 2¹ = 25439969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25439951) 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, 1095 + ... + 7216.

It is an arithmetic number, because the mean of its divisors is an integer number (6362836).

Almost surely, 2^25439971 is an apocalyptic number.

25439971 is a deficient number, since it is larger than the sum of its proper divisors (11373).

25439971 is an equidigital number, since it uses as much as digits as its factorization.

25439971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11372.

The product of its digits is 68040, while the sum is 40.

The square root of 25439971 is about 5043.8052103546. The cubic root of 25439971 is about 294.1071192490.

The spelling of 25439971 in words is "twenty-five million, four hundred thirty-nine thousand, nine hundred seventy-one".