25938721 has 2 divisors, whose sum is σ = 25938722. Its totient is φ = 25938720.

The previous prime is 25938709. The next prime is 25938749. The reversal of 25938721 is 12783952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24403600 + 1535121 = 4940^2 + 1239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25938721 is a prime.

It is not a weakly prime, because it can be changed into another prime (25938751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12969360 + 12969361.

It is an arithmetic number, because the mean of its divisors is an integer number (12969361).

Almost surely, 2^25938721 is an apocalyptic number.

It is an amenable number.

25938721 is a deficient number, since it is larger than the sum of its proper divisors (1).

25938721 is an equidigital number, since it uses as much as digits as its factorization.

25938721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 25938721 is about 5093.0070685205. The cubic root of 25938721 is about 296.0166817053.

The spelling of 25938721 in words is "twenty-five million, nine hundred thirty-eight thousand, seven hundred twenty-one".