11991417 has 8 divisors (see below), whose sum is σ = 16135680. Its totient is φ = 7920720.

The previous prime is 11991407. The next prime is 11991433. The reversal of 11991417 is 71419911.

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

It is a de Polignac number, because none of the positive numbers 2^k-11991417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11991407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18009 + ... + 18662.

It is an arithmetic number, because the mean of its divisors is an integer number (2016960).

Almost surely, 2^11991417 is an apocalyptic number.

It is an amenable number.

11991417 is a deficient number, since it is larger than the sum of its proper divisors (4144263).

11991417 is a wasteful number, since it uses less digits than its factorization.

11991417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36783.

The product of its digits is 2268, while the sum is 33.

The square root of 11991417 is about 3462.8625441966. The cubic root of 11991417 is about 228.8882517010. Note that the first 3 decimals are identical.

The spelling of 11991417 in words is "eleven million, nine hundred ninety-one thousand, four hundred seventeen".