396969977 has 2 divisors, whose sum is σ = 396969978. Its totient is φ = 396969976.

The previous prime is 396969971. The next prime is 396970027. The reversal of 396969977 is 779969693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 374964496 + 22005481 = 19364^2 + 4691^2 .

It is a cyclic number.

It is not a de Polignac number, because 396969977 - 2⁸ = 396969721 is a prime.

It is not a weakly prime, because it can be changed into another prime (396969971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198484988 + 198484989.

It is an arithmetic number, because the mean of its divisors is an integer number (198484989).

Almost surely, 2^396969977 is an apocalyptic number.

It is an amenable number.

396969977 is a deficient number, since it is larger than the sum of its proper divisors (1).

396969977 is an equidigital number, since it uses as much as digits as its factorization.

396969977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34720812, while the sum is 65.

The square root of 396969977 is about 19924.1054253384. The cubic root of 396969977 is about 734.9411321572.

The spelling of 396969977 in words is "three hundred ninety-six million, nine hundred sixty-nine thousand, nine hundred seventy-seven".