11917985 has 8 divisors (see below), whose sum is σ = 14794920. Its totient is φ = 9205504.

The previous prime is 11917973. The next prime is 11917993. The reversal of 11917985 is 58971911.

It can be written as a sum of positive squares in 4 ways, for example, as 1681 + 11916304 = 41^2 + 3452^2 .

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 11917985 - 2⁸ = 11917729 is a prime.

It is a super-3 number, since 3×11917985³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 40952 + ... + 41241.

It is an arithmetic number, because the mean of its divisors is an integer number (1849365).

Almost surely, 2^11917985 is an apocalyptic number.

It is an amenable number.

11917985 is a deficient number, since it is larger than the sum of its proper divisors (2876935).

11917985 is an equidigital number, since it uses as much as digits as its factorization.

11917985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82227.

The product of its digits is 22680, while the sum is 41.

The square root of 11917985 is about 3452.2434734532. The cubic root of 11917985 is about 228.4200794004.

The spelling of 11917985 in words is "eleven million, nine hundred seventeen thousand, nine hundred eighty-five".