636240403 has 4 divisors (see below), whose sum is σ = 669726760. Its totient is φ = 602754048.

The previous prime is 636240383. The next prime is 636240433. The reversal of 636240403 is 304042636.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636240403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636240433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16743150 + ... + 16743187.

It is an arithmetic number, because the mean of its divisors is an integer number (167431690).

Almost surely, 2^636240403 is an apocalyptic number.

636240403 is a deficient number, since it is larger than the sum of its proper divisors (33486357).

636240403 is a wasteful number, since it uses less digits than its factorization.

636240403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33486356.

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 636240403 is about 25223.8062750252. The cubic root of 636240403 is about 860.0831013081.

The spelling of 636240403 in words is "six hundred thirty-six million, two hundred forty thousand, four hundred three".