397988677 has 2 divisors, whose sum is σ = 397988678. Its totient is φ = 397988676.

The previous prime is 397988651. The next prime is 397988707. The reversal of 397988677 is 776889793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393863716 + 4124961 = 19846^2 + 2031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397988677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397982677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198994338 + 198994339.

It is an arithmetic number, because the mean of its divisors is an integer number (198994339).

Almost surely, 2^397988677 is an apocalyptic number.

It is an amenable number.

397988677 is a deficient number, since it is larger than the sum of its proper divisors (1).

397988677 is an equidigital number, since it uses as much as digits as its factorization.

397988677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32006016, while the sum is 64.

The square root of 397988677 is about 19949.6535558891. The cubic root of 397988677 is about 735.5692611209.

The spelling of 397988677 in words is "three hundred ninety-seven million, nine hundred eighty-eight thousand, six hundred seventy-seven".