11978845 has 4 divisors (see below), whose sum is σ = 14374620. Its totient is φ = 9583072.

The previous prime is 11978831. The next prime is 11978851. The reversal of 11978845 is 54887911.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4372281 + 7606564 = 2091^2 + 2758^2 .

It is a cyclic number.

It is not a de Polignac number, because 11978845 - 2⁷ = 11978717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1197880 + ... + 1197889.

It is an arithmetic number, because the mean of its divisors is an integer number (3593655).

Almost surely, 2^11978845 is an apocalyptic number.

It is an amenable number.

11978845 is a deficient number, since it is larger than the sum of its proper divisors (2395775).

11978845 is an equidigital number, since it uses as much as digits as its factorization.

11978845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2395774.

The product of its digits is 80640, while the sum is 43.

The square root of 11978845 is about 3461.0468069646. The cubic root of 11978845 is about 228.8082336536.

The spelling of 11978845 in words is "eleven million, nine hundred seventy-eight thousand, eight hundred forty-five".