397749823 has 2 divisors, whose sum is σ = 397749824. Its totient is φ = 397749822.

The previous prime is 397749773. The next prime is 397749839. The reversal of 397749823 is 328947793.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (328947793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397749823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397749893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198874911 + 198874912.

It is an arithmetic number, because the mean of its divisors is an integer number (198874912).

Almost surely, 2^397749823 is an apocalyptic number.

397749823 is a deficient number, since it is larger than the sum of its proper divisors (1).

397749823 is an equidigital number, since it uses as much as digits as its factorization.

397749823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 52.

The square root of 397749823 is about 19943.6662376806. Note that the first 3 decimals coincide. The cubic root of 397749823 is about 735.4220803678.

The spelling of 397749823 in words is "three hundred ninety-seven million, seven hundred forty-nine thousand, eight hundred twenty-three".