7725689 has 2 divisors, whose sum is σ = 7725690. Its totient is φ = 7725688.

The previous prime is 7725659. The next prime is 7725709. The reversal of 7725689 is 9865277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7507600 + 218089 = 2740^2 + 467^2 .

It is an emirp because it is prime and its reverse (9865277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7725689 - 2⁸ = 7725433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7725649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3862844 + 3862845.

It is an arithmetic number, because the mean of its divisors is an integer number (3862845).

Almost surely, 2^7725689 is an apocalyptic number.

It is an amenable number.

7725689 is a deficient number, since it is larger than the sum of its proper divisors (1).

7725689 is an equidigital number, since it uses as much as digits as its factorization.

7725689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 7725689 is about 2779.5123673047. The cubic root of 7725689 is about 197.6874383552.

The spelling of 7725689 in words is "seven million, seven hundred twenty-five thousand, six hundred eighty-nine".