11989213 has 4 divisors (see below), whose sum is σ = 12192480. Its totient is φ = 11785948.

The previous prime is 11989193. The next prime is 11989253. The reversal of 11989213 is 31298911.

11989213 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11989213 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 (11989253) 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, 101545 + ... + 101662.

It is an arithmetic number, because the mean of its divisors is an integer number (3048120).

Almost surely, 2^11989213 is an apocalyptic number.

It is an amenable number.

11989213 is a deficient number, since it is larger than the sum of its proper divisors (203267).

11989213 is an equidigital number, since it uses as much as digits as its factorization.

11989213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203266.

The product of its digits is 3888, while the sum is 34.

The square root of 11989213 is about 3462.5442957455. The cubic root of 11989213 is about 228.8742277644.

The spelling of 11989213 in words is "eleven million, nine hundred eighty-nine thousand, two hundred thirteen".