11685861 has 24 divisors (see below), whose sum is σ = 18869760. Its totient is φ = 6907200.

The previous prime is 11685859. The next prime is 11685871. The reversal of 11685861 is 16858611.

11685861 is a `hidden beast` number, since 11 + 68 + 586 + 1 = 666.

It is not a de Polignac number, because 11685861 - 2¹ = 11685859 is a prime.

It is a super-2 number, since 2×11685861² = 273118694622642, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11685841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2620 + ... + 5498.

It is an arithmetic number, because the mean of its divisors is an integer number (786240).

Almost surely, 2^11685861 is an apocalyptic number.

11685861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11685861 is a deficient number, since it is larger than the sum of its proper divisors (7183899).

11685861 is a wasteful number, since it uses less digits than its factorization.

11685861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2937 (or 2934 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 11685861 is about 3418.4588632891. The cubic root of 11685861 is about 226.9273833463.

The spelling of 11685861 in words is "eleven million, six hundred eighty-five thousand, eight hundred sixty-one".