11288639 has 4 divisors (see below), whose sum is σ = 11295360. Its totient is φ = 11281920.

The previous prime is 11288633. The next prime is 11288677. The reversal of 11288639 is 93688211.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11288639 - 2⁴ = 11288623 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 (11288633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1634 + ... + 5024.

It is an arithmetic number, because the mean of its divisors is an integer number (2823840).

Almost surely, 2^11288639 is an apocalyptic number.

11288639 is a deficient number, since it is larger than the sum of its proper divisors (6721).

11288639 is an equidigital number, since it uses as much as digits as its factorization.

11288639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6720.

The product of its digits is 20736, while the sum is 38.

The square root of 11288639 is about 3359.8569910042. The cubic root of 11288639 is about 224.3264730834.

The spelling of 11288639 in words is "eleven million, two hundred eighty-eight thousand, six hundred thirty-nine".