6436421 has 8 divisors (see below), whose sum is σ = 7174080. Its totient is φ = 5738688.

The previous prime is 6436379. The next prime is 6436447. The reversal of 6436421 is 1246346.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6436421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6436121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9641 + ... + 10286.

It is an arithmetic number, because the mean of its divisors is an integer number (896760).

Almost surely, 2^6436421 is an apocalyptic number.

It is an amenable number.

6436421 is a deficient number, since it is larger than the sum of its proper divisors (737659).

6436421 is a wasteful number, since it uses less digits than its factorization.

6436421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19963.

The product of its digits is 3456, while the sum is 26.

The square root of 6436421 is about 2537.0102483041. The cubic root of 6436421 is about 186.0150775922.

The spelling of 6436421 in words is "six million, four hundred thirty-six thousand, four hundred twenty-one".