11938989 has 4 divisors (see below), whose sum is σ = 15918656. Its totient is φ = 7959324.

The previous prime is 11938967. The next prime is 11938991. The reversal of 11938989 is 98983911.

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.

It is not a de Polignac number, because 11938989 - 2⁵ = 11938957 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 (11938919) 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, 1989829 + ... + 1989834.

It is an arithmetic number, because the mean of its divisors is an integer number (3979664).

Almost surely, 2^11938989 is an apocalyptic number.

It is an amenable number.

11938989 is a deficient number, since it is larger than the sum of its proper divisors (3979667).

11938989 is an equidigital number, since it uses as much as digits as its factorization.

11938989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3979666.

The product of its digits is 139968, while the sum is 48.

The square root of 11938989 is about 3455.2842140698. The cubic root of 11938989 is about 228.5541881900.

Subtracting from 11938989 its sum of digits (48), we obtain a triangular number (11938941 = T₄₈₈₆).

The spelling of 11938989 in words is "eleven million, nine hundred thirty-eight thousand, nine hundred eighty-nine".