5636421 has 18 divisors (see below), whose sum is σ = 9471462. Its totient is φ = 3220560.

The previous prime is 5636419. The next prime is 5636437. The reversal of 5636421 is 1246365.

5636421 is a `hidden beast` number, since 5 + 636 + 4 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5239521 + 396900 = 2289^2 + 630^2 .

It is not a de Polignac number, because 5636421 - 2¹ = 5636419 is a prime.

It is a Curzon number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5636471) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5950 + ... + 6831.

Almost surely, 2^5636421 is an apocalyptic number.

It is an amenable number.

5636421 is a deficient number, since it is larger than the sum of its proper divisors (3835041).

5636421 is a wasteful number, since it uses less digits than its factorization.

5636421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12801 (or 12791 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 5636421 is about 2374.1147823979. The cubic root of 5636421 is about 177.9649491225.

The spelling of 5636421 in words is "five million, six hundred thirty-six thousand, four hundred twenty-one".