11891665 has 8 divisors (see below), whose sum is σ = 14358528. Its totient is φ = 9454320.

The previous prime is 11891657. The next prime is 11891699. The reversal of 11891665 is 56619811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11891665 - 2³ = 11891657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6481 + ... + 8110.

It is an arithmetic number, because the mean of its divisors is an integer number (1794816).

Almost surely, 2^11891665 is an apocalyptic number.

It is an amenable number.

11891665 is a deficient number, since it is larger than the sum of its proper divisors (2466863).

11891665 is a wasteful number, since it uses less digits than its factorization.

11891665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14759.

The product of its digits is 12960, while the sum is 37.

The square root of 11891665 is about 3448.4293526184. The cubic root of 11891665 is about 228.2518057750.

The spelling of 11891665 in words is "eleven million, eight hundred ninety-one thousand, six hundred sixty-five".