7656989 has 2 divisors, whose sum is σ = 7656990. Its totient is φ = 7656988.

The previous prime is 7656959. The next prime is 7656991. The reversal of 7656989 is 9896567.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4708900 + 2948089 = 2170^2 + 1717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7656989 is a prime.

It is a super-2 number, since 2×7656989² = 117258961092242, which contains 22 as substring.

Together with 7656991, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7656949) 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, 3828494 + 3828495.

It is an arithmetic number, because the mean of its divisors is an integer number (3828495).

Almost surely, 2^7656989 is an apocalyptic number.

It is an amenable number.

7656989 is a deficient number, since it is larger than the sum of its proper divisors (1).

7656989 is an equidigital number, since it uses as much as digits as its factorization.

7656989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 50.

The square root of 7656989 is about 2767.1264878932. The cubic root of 7656989 is about 197.0997201855.

The spelling of 7656989 in words is "seven million, six hundred fifty-six thousand, nine hundred eighty-nine".