6423997 has 2 divisors, whose sum is σ = 6423998. Its totient is φ = 6423996.

The previous prime is 6423953. The next prime is 6424001. The reversal of 6423997 is 7993246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4813636 + 1610361 = 2194^2 + 1269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6423997 is a prime.

It is a Chen prime.

6423997 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6423917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3211998 + 3211999.

It is an arithmetic number, because the mean of its divisors is an integer number (3211999).

Almost surely, 2^6423997 is an apocalyptic number.

It is an amenable number.

6423997 is a deficient number, since it is larger than the sum of its proper divisors (1).

6423997 is an equidigital number, since it uses as much as digits as its factorization.

6423997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 40.

The square root of 6423997 is about 2534.5605141720. The cubic root of 6423997 is about 185.8953143521.

The spelling of 6423997 in words is "six million, four hundred twenty-three thousand, nine hundred ninety-seven".