397127869 has 2 divisors, whose sum is σ = 397127870. Its totient is φ = 397127868.

The previous prime is 397127851. The next prime is 397127891. The reversal of 397127869 is 968721793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 323820025 + 73307844 = 17995^2 + 8562^2 .

It is a cyclic number.

It is not a de Polignac number, because 397127869 - 2¹⁷ = 396996797 is a prime.

It is a super-2 number, since 2×397127869² = 315421088672962322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397127839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198563934 + 198563935.

It is an arithmetic number, because the mean of its divisors is an integer number (198563935).

Almost surely, 2^397127869 is an apocalyptic number.

It is an amenable number.

397127869 is a deficient number, since it is larger than the sum of its proper divisors (1).

397127869 is an equidigital number, since it uses as much as digits as its factorization.

397127869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 52.

The square root of 397127869 is about 19928.0673674092. The cubic root of 397127869 is about 735.0385584535.

The spelling of 397127869 in words is "three hundred ninety-seven million, one hundred twenty-seven thousand, eight hundred sixty-nine".