25387949 has 2 divisors, whose sum is σ = 25387950. Its totient is φ = 25387948.

The previous prime is 25387937. The next prime is 25388003. The reversal of 25387949 is 94978352.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23377225 + 2010724 = 4835^2 + 1418^2 .

It is a cyclic number.

It is not a de Polignac number, because 25387949 - 2⁸ = 25387693 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25387049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12693974 + 12693975.

It is an arithmetic number, because the mean of its divisors is an integer number (12693975).

Almost surely, 2^25387949 is an apocalyptic number.

It is an amenable number.

25387949 is a deficient number, since it is larger than the sum of its proper divisors (1).

25387949 is an equidigital number, since it uses as much as digits as its factorization.

25387949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 47.

The square root of 25387949 is about 5038.6455521301. The cubic root of 25387949 is about 293.9065099874.

The spelling of 25387949 in words is "twenty-five million, three hundred eighty-seven thousand, nine hundred forty-nine".