636346421 has 8 divisors (see below), whose sum is σ = 638818488. Its totient is φ = 633880000.

The previous prime is 636346411. The next prime is 636346439. The reversal of 636346421 is 124643636.

It can be written as a sum of positive squares in 4 ways, for example, as 45796 + 636300625 = 214^2 + 25225^2 .

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 636346421 - 2⁶ = 636346357 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 (636346411) 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, 488471 + ... + 489771.

It is an arithmetic number, because the mean of its divisors is an integer number (79852311).

Almost surely, 2^636346421 is an apocalyptic number.

It is an amenable number.

636346421 is a deficient number, since it is larger than the sum of its proper divisors (2472067).

636346421 is a wasteful number, since it uses less digits than its factorization.

636346421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823.

The product of its digits is 62208, while the sum is 35.

The square root of 636346421 is about 25225.9077339151. The cubic root of 636346421 is about 860.1308711058.

The spelling of 636346421 in words is "six hundred thirty-six million, three hundred forty-six thousand, four hundred twenty-one".