6396399 has 18 divisors (see below), whose sum is σ = 9442368. Its totient is φ = 4172400.

The previous prime is 6396389. The next prime is 6396409. The reversal of 6396399 is 9936936.

6396399 is a `hidden beast` number, since 6 + 3 + 9 + 639 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (6396389) and next prime (6396409).

It is not a de Polignac number, because 6396399 - 2²¹ = 4299247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6396349) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 33394 + ... + 33584.

It is an arithmetic number, because the mean of its divisors is an integer number (524576).

Almost surely, 2^6396399 is an apocalyptic number.

6396399 is a deficient number, since it is larger than the sum of its proper divisors (3045969).

6396399 is a wasteful number, since it uses less digits than its factorization.

6396399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 255 counting only the distinct ones).

The product of its digits is 236196, while the sum is 45.

The square root of 6396399 is about 2529.1103178786. The cubic root of 6396399 is about 185.6287252254.

The spelling of 6396399 in words is "six million, three hundred ninety-six thousand, three hundred ninety-nine".