25489729 has 2 divisors, whose sum is σ = 25489730. Its totient is φ = 25489728.

The previous prime is 25489699. The next prime is 25489733. The reversal of 25489729 is 92798452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22420225 + 3069504 = 4735^2 + 1752^2 .

It is a cyclic number.

It is not a de Polignac number, because 25489729 - 2⁷ = 25489601 is a prime.

It is not a weakly prime, because it can be changed into another prime (25486729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12744864 + 12744865.

It is an arithmetic number, because the mean of its divisors is an integer number (12744865).

Almost surely, 2^25489729 is an apocalyptic number.

It is an amenable number.

25489729 is a deficient number, since it is larger than the sum of its proper divisors (1).

25489729 is an equidigital number, since it uses as much as digits as its factorization.

25489729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 46.

The square root of 25489729 is about 5048.7353862131. The cubic root of 25489729 is about 294.2987422584.

The spelling of 25489729 in words is "twenty-five million, four hundred eighty-nine thousand, seven hundred twenty-nine".