6436391 has 8 divisors (see below), whose sum is σ = 7010640. Its totient is φ = 5873472.

The previous prime is 6436379. The next prime is 6436447. The reversal of 6436391 is 1936346.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6436391 - 2⁶ = 6436327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6436301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1625 + ... + 3938.

It is an arithmetic number, because the mean of its divisors is an integer number (876330).

Almost surely, 2^6436391 is an apocalyptic number.

6436391 is a deficient number, since it is larger than the sum of its proper divisors (574249).

6436391 is a wasteful number, since it uses less digits than its factorization.

6436391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5665.

The product of its digits is 11664, while the sum is 32.

The square root of 6436391 is about 2537.0043358260. The cubic root of 6436391 is about 186.0147885879.

The spelling of 6436391 in words is "six million, four hundred thirty-six thousand, three hundred ninety-one".