11978819 has 2 divisors, whose sum is σ = 11978820. Its totient is φ = 11978818.

The previous prime is 11978737. The next prime is 11978831. The reversal of 11978819 is 91887911.

It is a strong prime.

It is an emirp because it is prime and its reverse (91887911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11978819 - 2¹⁶ = 11913283 is a prime.

It is a super-2 number, since 2×11978819² = 286984209269522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11978819.

It is not a weakly prime, because it can be changed into another prime (11978419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5989409 + 5989410.

It is an arithmetic number, because the mean of its divisors is an integer number (5989410).

Almost surely, 2^11978819 is an apocalyptic number.

11978819 is a deficient number, since it is larger than the sum of its proper divisors (1).

11978819 is an equidigital number, since it uses as much as digits as its factorization.

11978819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 44.

The square root of 11978819 is about 3461.0430508735. The cubic root of 11978819 is about 228.8080681113.

The spelling of 11978819 in words is "eleven million, nine hundred seventy-eight thousand, eight hundred nineteen".