11387989 has 4 divisors (see below), whose sum is σ = 11498656. Its totient is φ = 11277324.

The previous prime is 11387953. The next prime is 11388017. The reversal of 11387989 is 98978311.

11387989 is digitally balanced in base 2, 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98978311 = 683 ⋅144917.

It is a cyclic number.

It is not a de Polignac number, because 11387989 - 2⁷ = 11387861 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 (11387939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55179 + ... + 55384.

It is an arithmetic number, because the mean of its divisors is an integer number (2874664).

Almost surely, 2^11387989 is an apocalyptic number.

It is an amenable number.

11387989 is a deficient number, since it is larger than the sum of its proper divisors (110667).

11387989 is a wasteful number, since it uses less digits than its factorization.

11387989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110666.

The product of its digits is 108864, while the sum is 46.

The square root of 11387989 is about 3374.6094588856. The cubic root of 11387989 is about 224.9826422824.

The spelling of 11387989 in words is "eleven million, three hundred eighty-seven thousand, nine hundred eighty-nine".