636414421 has 4 divisors (see below), whose sum is σ = 637271712. Its totient is φ = 635557132.

The previous prime is 636414343. The next prime is 636414437. The reversal of 636414421 is 124414636.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 636414421 - 2⁷ = 636414293 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 (636411421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427531 + ... + 429016.

It is an arithmetic number, because the mean of its divisors is an integer number (159317928).

Almost surely, 2^636414421 is an apocalyptic number.

It is an amenable number.

636414421 is a deficient number, since it is larger than the sum of its proper divisors (857291).

636414421 is an equidigital number, since it uses as much as digits as its factorization.

636414421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857290.

The product of its digits is 13824, while the sum is 31.

The square root of 636414421 is about 25227.2555185854. The cubic root of 636414421 is about 860.1615078858.

The spelling of 636414421 in words is "six hundred thirty-six million, four hundred fourteen thousand, four hundred twenty-one".