11921879 has 16 divisors (see below), whose sum is σ = 13229568. Its totient is φ = 10695552.

The previous prime is 11921867. The next prime is 11921933. The reversal of 11921879 is 97812911.

It is a cyclic number.

It is not a de Polignac number, because 11921879 - 2¹² = 11917783 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 (11926879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34184 + ... + 34530.

It is an arithmetic number, because the mean of its divisors is an integer number (826848).

Almost surely, 2^11921879 is an apocalyptic number.

11921879 is a deficient number, since it is larger than the sum of its proper divisors (1307689).

11921879 is a wasteful number, since it uses less digits than its factorization.

11921879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454.

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

The square root of 11921879 is about 3452.8074084721. The cubic root of 11921879 is about 228.4449541571. Note that the first 3 decimals are identical.

The spelling of 11921879 in words is "eleven million, nine hundred twenty-one thousand, eight hundred seventy-nine".