11991678 has 16 divisors (see below), whose sum is σ = 24085776. Its totient is φ = 3980160.

The previous prime is 11991659. The next prime is 11991689. The reversal of 11991678 is 87619911.

11991678 is nontrivially palindromic in base 11.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2701 + ... + 5592.

It is an arithmetic number, because the mean of its divisors is an integer number (1505361).

Almost surely, 2^11991678 is an apocalyptic number.

11991678 is an abundant number, since it is smaller than the sum of its proper divisors (12094098).

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

11991678 is a wasteful number, since it uses less digits than its factorization.

11991678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8539.

The product of its digits is 27216, while the sum is 42.

The square root of 11991678 is about 3462.9002295764. The cubic root of 11991678 is about 228.8899123165.

The spelling of 11991678 in words is "eleven million, nine hundred ninety-one thousand, six hundred seventy-eight".