11979878 has 4 divisors (see below), whose sum is σ = 17969820. Its totient is φ = 5989938.

The previous prime is 11979853. The next prime is 11979889. The reversal of 11979878 is 87897911.

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

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 as a sum of consecutive naturals, namely, 2994968 + ... + 2994971.

It is an arithmetic number, because the mean of its divisors is an integer number (4492455).

Almost surely, 2^11979878 is an apocalyptic number.

11979878 is a deficient number, since it is larger than the sum of its proper divisors (5989942).

11979878 is an equidigital number, since it uses as much as digits as its factorization.

11979878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5989941.

The product of its digits is 254016, while the sum is 50.

The square root of 11979878 is about 3461.1960360546. The cubic root of 11979878 is about 228.8148105846.

It can be divided in two parts, 119 and 79878, that added together give a palindrome (79997).

The spelling of 11979878 in words is "eleven million, nine hundred seventy-nine thousand, eight hundred seventy-eight".