6399626 has 4 divisors (see below), whose sum is σ = 9599442. Its totient is φ = 3199812.

The previous prime is 6399611. The next prime is 6399629. The reversal of 6399626 is 6269936.

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., 5499025 + 900601 = 2345^2 + 949^2 .

It is not an unprimeable number, because it can be changed into a prime (6399629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1599905 + ... + 1599908.

Almost surely, 2^6399626 is an apocalyptic number.

6399626 is a deficient number, since it is larger than the sum of its proper divisors (3199816).

6399626 is a wasteful number, since it uses less digits than its factorization.

6399626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3199815.

The product of its digits is 104976, while the sum is 41.

The square root of 6399626 is about 2529.7482088145. The cubic root of 6399626 is about 185.6599367028.

The spelling of 6399626 in words is "six million, three hundred ninety-nine thousand, six hundred twenty-six".