397960877449 has 2 divisors, whose sum is σ = 397960877450. Its totient is φ = 397960877448.

The previous prime is 397960877387. The next prime is 397960877473. The reversal of 397960877449 is 944778069793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289759353849 + 108201523600 = 538293^2 + 328940^2 .

It is a cyclic number.

It is not a de Polignac number, because 397960877449 - 2¹⁵ = 397960844681 is a prime.

It is not a weakly prime, because it can be changed into another prime (397960871449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198980438724 + 198980438725.

It is an arithmetic number, because the mean of its divisors is an integer number (198980438725).

Almost surely, 2^397960877449 is an apocalyptic number.

It is an amenable number.

397960877449 is a deficient number, since it is larger than the sum of its proper divisors (1).

397960877449 is an equidigital number, since it uses as much as digits as its factorization.

397960877449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576108288, while the sum is 73.

The spelling of 397960877449 in words is "three hundred ninety-seven billion, nine hundred sixty million, eight hundred seventy-seven thousand, four hundred forty-nine".