79803989 has 2 divisors, whose sum is σ = 79803990. Its totient is φ = 79803988.

The previous prime is 79803973. The next prime is 79803991. The reversal of 79803989 is 98930897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72965764 + 6838225 = 8542^2 + 2615^2 .

It is a cyclic number.

It is not a de Polignac number, because 79803989 - 2⁴ = 79803973 is a prime.

It is a Sophie Germain prime.

Together with 79803991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 79803989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79800989) 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, 39901994 + 39901995.

It is an arithmetic number, because the mean of its divisors is an integer number (39901995).

Almost surely, 2^79803989 is an apocalyptic number.

It is an amenable number.

79803989 is a deficient number, since it is larger than the sum of its proper divisors (1).

79803989 is an equidigital number, since it uses as much as digits as its factorization.

79803989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 79803989 is about 8933.3078420034. The cubic root of 79803989 is about 430.5347394563.

The spelling of 79803989 in words is "seventy-nine million, eight hundred three thousand, nine hundred eighty-nine".