6393636 has 18 divisors (see below), whose sum is σ = 16161782. Its totient is φ = 2131200.

The previous prime is 6393623. The next prime is 6393641. The reversal of 6393636 is 6363936.

It can be written as a sum of positive squares in only one way, i.e., 4161600 + 2232036 = 2040^2 + 1494^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 177601 = 6393636 / (6 + 3 + 9 + 3 + 6 + 3 + 6).

It is a nude number because it is divisible by every one of its digits.

It is a d-powerful number, because it can be written as 6² + 3³ + 9³ + 3¹³ + 6⁵ + 3¹⁴ + 6⁵ .

It is a self number, because there is not a number n which added to its sum of digits gives 6393636.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88765 + ... + 88836.

Almost surely, 2^6393636 is an apocalyptic number.

It is an amenable number.

6393636 is an abundant number, since it is smaller than the sum of its proper divisors (9768146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6393636 is a wasteful number, since it uses less digits than its factorization.

6393636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177611 (or 177606 counting only the distinct ones).

The product of its digits is 52488, while the sum is 36.

The square root of 6393636 is about 2528.5640193596. The cubic root of 6393636 is about 185.6019932034.

The spelling of 6393636 in words is "six million, three hundred ninety-three thousand, six hundred thirty-six".