11978801 has 4 divisors (see below), whose sum is σ = 11986932. Its totient is φ = 11970672.

The previous prime is 11978737. The next prime is 11978819. The reversal of 11978801 is 10887911.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10887911 = 163 ⋅66797.

It can be written as a sum of positive squares in 2 ways, for example, as 6451600 + 5527201 = 2540^2 + 2351^2 .

It is a cyclic number.

It is not a de Polignac number, because 11978801 - 2⁶ = 11978737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11978831) 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 in 3 ways as a sum of consecutive naturals, for example, 1166 + ... + 5031.

It is an arithmetic number, because the mean of its divisors is an integer number (2996733).

Almost surely, 2^11978801 is an apocalyptic number.

It is an amenable number.

11978801 is a deficient number, since it is larger than the sum of its proper divisors (8131).

11978801 is an equidigital number, since it uses as much as digits as its factorization.

11978801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8130.

The product of its (nonzero) digits is 4032, while the sum is 35.

The square root of 11978801 is about 3461.0404505004. The cubic root of 11978801 is about 228.8079535049.

The spelling of 11978801 in words is "eleven million, nine hundred seventy-eight thousand, eight hundred one".