6436399 has 4 divisors (see below), whose sum is σ = 6461136. Its totient is φ = 6411664.

The previous prime is 6436379. The next prime is 6436447. The reversal of 6436399 is 9936346.

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

It is a cyclic number.

It is not a de Polignac number, because 6436399 - 2⁷ = 6436271 is a prime.

It is a Duffinian number.

6436399 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6436379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11974 + ... + 12499.

It is an arithmetic number, because the mean of its divisors is an integer number (1615284).

Almost surely, 2^6436399 is an apocalyptic number.

6436399 is a deficient number, since it is larger than the sum of its proper divisors (24737).

6436399 is a wasteful number, since it uses less digits than its factorization.

6436399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24736.

The product of its digits is 104976, while the sum is 40.

The square root of 6436399 is about 2537.0059124882. The cubic root of 6436399 is about 186.0148656558.

It can be divided in two parts, 64 and 36399, that added together give a palindrome (36463).

The spelling of 6436399 in words is "six million, four hundred thirty-six thousand, three hundred ninety-nine".