11921789 has 8 divisors (see below), whose sum is σ = 13040832. Its totient is φ = 10808640.

The previous prime is 11921773. The next prime is 11921827. The reversal of 11921789 is 98712911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11921789 - 2⁴ = 11921773 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11921719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3512 + ... + 6014.

It is an arithmetic number, because the mean of its divisors is an integer number (1630104).

Almost surely, 2^11921789 is an apocalyptic number.

It is an amenable number.

11921789 is a deficient number, since it is larger than the sum of its proper divisors (1119043).

11921789 is a wasteful number, since it uses less digits than its factorization.

11921789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2947.

The product of its digits is 9072, while the sum is 38.

The square root of 11921789 is about 3452.7943755747. The cubic root of 11921789 is about 228.4443793009. Note that the first 3 decimals are identical.

The spelling of 11921789 in words is "eleven million, nine hundred twenty-one thousand, seven hundred eighty-nine".