11921779 has 8 divisors (see below), whose sum is σ = 12302288. Its totient is φ = 11547360.

The previous prime is 11921773. The next prime is 11921827. The reversal of 11921779 is 97712911.

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 11921779 - 2¹⁵ = 11889011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11921773) 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, 2629 + ... + 5545.

It is an arithmetic number, because the mean of its divisors is an integer number (1537786).

Almost surely, 2^11921779 is an apocalyptic number.

11921779 is a deficient number, since it is larger than the sum of its proper divisors (380509).

11921779 is an equidigital number, since it uses as much as digits as its factorization.

11921779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045.

The product of its digits is 7938, while the sum is 37.

The square root of 11921779 is about 3452.7929274719. The cubic root of 11921779 is about 228.4443154279. Note that the first 3 decimals are identical.

It can be divided in two parts, 1 and 1921779, that added together give a triangular number (1921780 = T₁₉₆₀).

The spelling of 11921779 in words is "eleven million, nine hundred twenty-one thousand, seven hundred seventy-nine".