397677989 has 2 divisors, whose sum is σ = 397677990. Its totient is φ = 397677988.

The previous prime is 397677967. The next prime is 397678009. The reversal of 397677989 is 989776793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313644100 + 84033889 = 17710^2 + 9167^2 .

It is an emirp because it is prime and its reverse (989776793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397677989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397677949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198838994 + 198838995.

It is an arithmetic number, because the mean of its divisors is an integer number (198838995).

Almost surely, 2^397677989 is an apocalyptic number.

It is an amenable number.

397677989 is a deficient number, since it is larger than the sum of its proper divisors (1).

397677989 is an equidigital number, since it uses as much as digits as its factorization.

397677989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36006768, while the sum is 65.

The square root of 397677989 is about 19941.8652337238. The cubic root of 397677989 is about 735.3778050576.

The spelling of 397677989 in words is "three hundred ninety-seven million, six hundred seventy-seven thousand, nine hundred eighty-nine".