397916423 has 2 divisors, whose sum is σ = 397916424. Its totient is φ = 397916422.

The previous prime is 397916383. The next prime is 397916459. The reversal of 397916423 is 324619793.

It is a strong prime.

It is an emirp because it is prime and its reverse (324619793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397916423 is a prime.

It is a super-2 number, since 2×397916423² = 316674959386229858, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397916723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198958211 + 198958212.

It is an arithmetic number, because the mean of its divisors is an integer number (198958212).

Almost surely, 2^397916423 is an apocalyptic number.

397916423 is a deficient number, since it is larger than the sum of its proper divisors (1).

397916423 is an equidigital number, since it uses as much as digits as its factorization.

397916423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 44.

The square root of 397916423 is about 19947.8425650495. The cubic root of 397916423 is about 735.5247447472.

It can be divided in two parts, 3979 and 16423, that added together give a palindrome (20402).

The spelling of 397916423 in words is "three hundred ninety-seven million, nine hundred sixteen thousand, four hundred twenty-three".