11919918 has 16 divisors (see below), whose sum is σ = 24052176. Its totient is φ = 3937920.

The previous prime is 11919863. The next prime is 11919923. The reversal of 11919918 is 81991911.

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 7 ways as a sum of consecutive naturals, for example, 8113 + ... + 9468.

It is an arithmetic number, because the mean of its divisors is an integer number (1503261).

Almost surely, 2^11919918 is an apocalyptic number.

11919918 is an abundant number, since it is smaller than the sum of its proper divisors (12132258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11919918 is a wasteful number, since it uses less digits than its factorization.

11919918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17699.

The product of its digits is 5832, while the sum is 39.

The square root of 11919918 is about 3452.5234249748. The cubic root of 11919918 is about 228.4324280243.

The spelling of 11919918 in words is "eleven million, nine hundred nineteen thousand, nine hundred eighteen".