11891916 has 18 divisors (see below), whose sum is σ = 30060212. Its totient is φ = 3963960.

The previous prime is 11891833. The next prime is 11891917. The reversal of 11891916 is 61919811.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 330331 = 11891916 / (1 + 1 + 8 + 9 + 1 + 9 + 1 + 6).

It is not an unprimeable number, because it can be changed into a prime (11891917) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 165130 + ... + 165201.

Almost surely, 2^11891916 is an apocalyptic number.

It is an amenable number.

11891916 is an abundant number, since it is smaller than the sum of its proper divisors (18168296).

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

11891916 is a wasteful number, since it uses less digits than its factorization.

11891916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330341 (or 330336 counting only the distinct ones).

The product of its digits is 3888, while the sum is 36.

The square root of 11891916 is about 3448.4657458064. The cubic root of 11891916 is about 228.2534116842.

The spelling of 11891916 in words is "eleven million, eight hundred ninety-one thousand, nine hundred sixteen".