397691443 has 2 divisors, whose sum is σ = 397691444. Its totient is φ = 397691442.

The previous prime is 397691419. The next prime is 397691453. The reversal of 397691443 is 344196793.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397691443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 397691393 and 397691402.

It is not a weakly prime, because it can be changed into another prime (397691453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198845721 + 198845722.

It is an arithmetic number, because the mean of its divisors is an integer number (198845722).

Almost surely, 2^397691443 is an apocalyptic number.

397691443 is a deficient number, since it is larger than the sum of its proper divisors (1).

397691443 is an equidigital number, since it uses as much as digits as its factorization.

397691443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 46.

The square root of 397691443 is about 19942.2025614023. The cubic root of 397691443 is about 735.3860979157.

The spelling of 397691443 in words is "three hundred ninety-seven million, six hundred ninety-one thousand, four hundred forty-three".