11817986 has 4 divisors (see below), whose sum is σ = 17726982. Its totient is φ = 5908992.

The previous prime is 11817983. The next prime is 11817997. The reversal of 11817986 is 68971811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 46225 = 3431^2 + 215^2 .

It is not an unprimeable number, because it can be changed into a prime (11817983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2954495 + ... + 2954498.

Almost surely, 2^11817986 is an apocalyptic number.

11817986 is a deficient number, since it is larger than the sum of its proper divisors (5908996).

11817986 is an equidigital number, since it uses as much as digits as its factorization.

11817986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5908995.

The product of its digits is 24192, while the sum is 41.

The square root of 11817986 is about 3437.7297741387. The cubic root of 11817986 is about 227.7794239994.

The spelling of 11817986 in words is "eleven million, eight hundred seventeen thousand, nine hundred eighty-six".