7790989 has 2 divisors, whose sum is σ = 7790990. Its totient is φ = 7790988.

The previous prime is 7790953. The next prime is 7791001. The reversal of 7790989 is 9890977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7784100 + 6889 = 2790^2 + 83^2 .

It is an emirp because it is prime and its reverse (9890977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7790989 - 2⁹ = 7790477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7790929) 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, 3895494 + 3895495.

It is an arithmetic number, because the mean of its divisors is an integer number (3895495).

Almost surely, 2^7790989 is an apocalyptic number.

It is an amenable number.

7790989 is a deficient number, since it is larger than the sum of its proper divisors (1).

7790989 is an equidigital number, since it uses as much as digits as its factorization.

7790989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 49.

The square root of 7790989 is about 2791.2343147790. The cubic root of 7790989 is about 198.2428489793.

The spelling of 7790989 in words is "seven million, seven hundred ninety thousand, nine hundred eighty-nine".