397496861 has 2 divisors, whose sum is σ = 397496862. Its totient is φ = 397496860.

The previous prime is 397496851. The next prime is 397496867. The reversal of 397496861 is 168694793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 377524900 + 19971961 = 19430^2 + 4469^2 .

It is a cyclic number.

It is not a de Polignac number, because 397496861 - 2⁶ = 397496797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397496867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198748430 + 198748431.

It is an arithmetic number, because the mean of its divisors is an integer number (198748431).

Almost surely, 2^397496861 is an apocalyptic number.

It is an amenable number.

397496861 is a deficient number, since it is larger than the sum of its proper divisors (1).

397496861 is an equidigital number, since it uses as much as digits as its factorization.

397496861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 53.

The square root of 397496861 is about 19937.3233158315. The cubic root of 397496861 is about 735.2661420689.

The spelling of 397496861 in words is "three hundred ninety-seven million, four hundred ninety-six thousand, eight hundred sixty-one".