11891864 has 16 divisors (see below), whose sum is σ = 22365720. Its totient is φ = 5927680.

The previous prime is 11891833. The next prime is 11891917. The reversal of 11891864 is 46819811.

11891864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 719 + ... + 4929.

Almost surely, 2^11891864 is an apocalyptic number.

It is an amenable number.

11891864 is a deficient number, since it is larger than the sum of its proper divisors (10473856).

11891864 is a wasteful number, since it uses less digits than its factorization.

11891864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4570 (or 4566 counting only the distinct ones).

The product of its digits is 13824, while the sum is 38.

The square root of 11891864 is about 3448.4582062133. The cubic root of 11891864 is about 228.2530789877.

The spelling of 11891864 in words is "eleven million, eight hundred ninety-one thousand, eight hundred sixty-four".