320402989 has 2 divisors, whose sum is σ = 320402990. Its totient is φ = 320402988.

The previous prime is 320402983. The next prime is 320403053. The reversal of 320402989 is 989204023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319515625 + 887364 = 17875^2 + 942^2 .

It is a cyclic number.

It is not a de Polignac number, because 320402989 - 2¹⁹ = 319878701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320402983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160201494 + 160201495.

It is an arithmetic number, because the mean of its divisors is an integer number (160201495).

Almost surely, 2^320402989 is an apocalyptic number.

It is an amenable number.

320402989 is a deficient number, since it is larger than the sum of its proper divisors (1).

320402989 is an equidigital number, since it uses as much as digits as its factorization.

320402989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 320402989 is about 17899.8041609399. The cubic root of 320402989 is about 684.2773838489.

The spelling of 320402989 in words is "three hundred twenty million, four hundred two thousand, nine hundred eighty-nine".