11861817 has 8 divisors (see below), whose sum is σ = 17253600. Its totient is φ = 7188960.

The previous prime is 11861803. The next prime is 11861819. The reversal of 11861817 is 71816811.

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

It is not a de Polignac number, because 11861817 - 2¹⁵ = 11829049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 359449 = 11861817 / (1 + 1 + 8 + 6 + 1 + 8 + 1 + 7).

It is not an unprimeable number, because it can be changed into a prime (11861819) 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, 179692 + ... + 179757.

It is an arithmetic number, because the mean of its divisors is an integer number (2156700).

Almost surely, 2^11861817 is an apocalyptic number.

It is an amenable number.

11861817 is a deficient number, since it is larger than the sum of its proper divisors (5391783).

11861817 is a wasteful number, since it uses less digits than its factorization.

11861817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359463.

The product of its digits is 2688, while the sum is 33.

The square root of 11861817 is about 3444.0988661768. The cubic root of 11861817 is about 228.0606756028.

It can be divided in two parts, 1186 and 1817, that added together give a palindrome (3003).

The spelling of 11861817 in words is "eleven million, eight hundred sixty-one thousand, eight hundred seventeen".