2397989917 has 2 divisors, whose sum is σ = 2397989918. Its totient is φ = 2397989916.

The previous prime is 2397989899. The next prime is 2397989953. The reversal of 2397989917 is 7199897932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2151939321 + 246050596 = 46389^2 + 15686^2 .

It is a cyclic number.

It is not a de Polignac number, because 2397989917 - 2²³ = 2389601309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2397989317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1198994958 + 1198994959.

It is an arithmetic number, because the mean of its divisors is an integer number (1198994959).

Almost surely, 2^2397989917 is an apocalyptic number.

It is an amenable number.

2397989917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2397989917 is an equidigital number, since it uses as much as digits as its factorization.

2397989917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15431472, while the sum is 64.

The square root of 2397989917 is about 48969.2752345795. The cubic root of 2397989917 is about 1338.4920135993.

The spelling of 2397989917 in words is "two billion, three hundred ninety-seven million, nine hundred eighty-nine thousand, nine hundred seventeen".