11666387 has 8 divisors (see below), whose sum is σ = 12052800. Its totient is φ = 11285824.

The previous prime is 11666383. The next prime is 11666393. The reversal of 11666387 is 78366611.

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

It is a cyclic number.

It is not a de Polignac number, because 11666387 - 2² = 11666383 is a prime.

It is a super-2 number, since 2×11666387² = 272209171267538, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11666387.

It is not an unprimeable number, because it can be changed into a prime (11666383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2789 + ... + 5577.

It is an arithmetic number, because the mean of its divisors is an integer number (1506600).

Almost surely, 2^11666387 is an apocalyptic number.

11666387 is the 2789-th pentagonal number.

11666387 is a deficient number, since it is larger than the sum of its proper divisors (386413).

11666387 is an equidigital number, since it uses as much as digits as its factorization.

11666387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2925.

The product of its digits is 36288, while the sum is 38.

The square root of 11666387 is about 3415.6093160665. The cubic root of 11666387 is about 226.8012582528.

The spelling of 11666387 in words is "eleven million, six hundred sixty-six thousand, three hundred eighty-seven".