25489939 has 2 divisors, whose sum is σ = 25489940. Its totient is φ = 25489938.

The previous prime is 25489931. The next prime is 25489969. The reversal of 25489939 is 93998452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25489939 - 2³ = 25489931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25489892 and 25489901.

It is not a weakly prime, because it can be changed into another prime (25489931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12744969 + 12744970.

It is an arithmetic number, because the mean of its divisors is an integer number (12744970).

Almost surely, 2^25489939 is an apocalyptic number.

25489939 is a deficient number, since it is larger than the sum of its proper divisors (1).

25489939 is an equidigital number, since it uses as much as digits as its factorization.

25489939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 49.

The square root of 25489939 is about 5048.7561834575. The cubic root of 25489939 is about 294.2995504606.

The spelling of 25489939 in words is "twenty-five million, four hundred eighty-nine thousand, nine hundred thirty-nine".