11978805 has 16 divisors (see below), whose sum is σ = 19267200. Its totient is φ = 6355008.

The previous prime is 11978737. The next prime is 11978819. The reversal of 11978805 is 50887911.

11978805 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11978805 - 2⁹ = 11978293 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 979 + ... + 4991.

It is an arithmetic number, because the mean of its divisors is an integer number (1204200).

Almost surely, 2^11978805 is an apocalyptic number.

11978805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11978805 is a deficient number, since it is larger than the sum of its proper divisors (7288395).

11978805 is a wasteful number, since it uses less digits than its factorization.

11978805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4220.

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 11978805 is about 3461.0410283613. The cubic root of 11978805 is about 228.8079789730.

The spelling of 11978805 in words is "eleven million, nine hundred seventy-eight thousand, eight hundred five".