389245993 has 2 divisors, whose sum is σ = 389245994. Its totient is φ = 389245992.

The previous prime is 389245973. The next prime is 389246003. The reversal of 389245993 is 399542983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361494169 + 27751824 = 19013^2 + 5268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389245993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 389245993.

It is not a weakly prime, because it can be changed into another prime (389245903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194622996 + 194622997.

It is an arithmetic number, because the mean of its divisors is an integer number (194622997).

Almost surely, 2^389245993 is an apocalyptic number.

It is an amenable number.

389245993 is a deficient number, since it is larger than the sum of its proper divisors (1).

389245993 is an equidigital number, since it uses as much as digits as its factorization.

389245993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2099520, while the sum is 52.

The square root of 389245993 is about 19729.3181078313. The cubic root of 389245993 is about 730.1432089090.

The spelling of 389245993 in words is "three hundred eighty-nine million, two hundred forty-five thousand, nine hundred ninety-three".