11648639 has 4 divisors (see below), whose sum is σ = 11661960. Its totient is φ = 11635320.

The previous prime is 11648597. The next prime is 11648641. The reversal of 11648639 is 93684611.

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-11648639 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 (11648239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5249 + ... + 7130.

It is an arithmetic number, because the mean of its divisors is an integer number (2915490).

Almost surely, 2^11648639 is an apocalyptic number.

11648639 is a deficient number, since it is larger than the sum of its proper divisors (13321).

11648639 is an equidigital number, since it uses as much as digits as its factorization.

11648639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13320.

The product of its digits is 31104, while the sum is 38.

The square root of 11648639 is about 3413.0102548923. The cubic root of 11648639 is about 226.6861894469.

The spelling of 11648639 in words is "eleven million, six hundred forty-eight thousand, six hundred thirty-nine".