6397994 has 4 divisors (see below), whose sum is σ = 9596994. Its totient is φ = 3198996.

The previous prime is 6397991. The next prime is 6397999. The reversal of 6397994 is 4997936.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4897369 + 1500625 = 2213^2 + 1225^2 .

It is not an unprimeable number, because it can be changed into a prime (6397991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1599497 + ... + 1599500.

Almost surely, 2^6397994 is an apocalyptic number.

6397994 is a deficient number, since it is larger than the sum of its proper divisors (3199000).

6397994 is a wasteful number, since it uses less digits than its factorization.

6397994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198999.

The product of its digits is 367416, while the sum is 47.

The square root of 6397994 is about 2529.4256265010. The cubic root of 6397994 is about 185.6441533441.

The spelling of 6397994 in words is "six million, three hundred ninety-seven thousand, nine hundred ninety-four".