11639899 has 4 divisors (see below), whose sum is σ = 11683440. Its totient is φ = 11596360.

The previous prime is 11639897. The next prime is 11639963. The reversal of 11639899 is 99893611.

11639899 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99893611 = 5167 ⋅19333.

It is a cyclic number.

It is not a de Polignac number, because 11639899 - 2¹ = 11639897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11639893) 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, 21367 + ... + 21904.

It is an arithmetic number, because the mean of its divisors is an integer number (2920860).

Almost surely, 2^11639899 is an apocalyptic number.

11639899 is a deficient number, since it is larger than the sum of its proper divisors (43541).

11639899 is an equidigital number, since it uses as much as digits as its factorization.

11639899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43540.

The product of its digits is 104976, while the sum is 46.

The square root of 11639899 is about 3411.7296200021. The cubic root of 11639899 is about 226.6294808760.

The spelling of 11639899 in words is "eleven million, six hundred thirty-nine thousand, eight hundred ninety-nine".