6438997 has 2 divisors, whose sum is σ = 6438998. Its totient is φ = 6438996.

The previous prime is 6438983. The next prime is 6439001. The reversal of 6438997 is 7998346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6345361 + 93636 = 2519^2 + 306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6438997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6438197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3219498 + 3219499.

It is an arithmetic number, because the mean of its divisors is an integer number (3219499).

Almost surely, 2^6438997 is an apocalyptic number.

It is an amenable number.

6438997 is a deficient number, since it is larger than the sum of its proper divisors (1).

6438997 is an equidigital number, since it uses as much as digits as its factorization.

6438997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 46.

The square root of 6438997 is about 2537.5178817104. The cubic root of 6438997 is about 186.0398900840.

The spelling of 6438997 in words is "six million, four hundred thirty-eight thousand, nine hundred ninety-seven".