11856861 has 10 divisors (see below), whose sum is σ = 17712222. Its totient is φ = 7904520.

The previous prime is 11856857. The next prime is 11856877. The reversal of 11856861 is 16865811.

It can be written as a sum of positive squares in only one way, i.e., 6125625 + 5731236 = 2475^2 + 2394^2 .

It is not a de Polignac number, because 11856861 - 2² = 11856857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11856811) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 73110 + ... + 73271.

Almost surely, 2^11856861 is an apocalyptic number.

It is an amenable number.

11856861 is a deficient number, since it is larger than the sum of its proper divisors (5855361).

11856861 is an equidigital number, since it uses as much as digits as its factorization.

11856861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146393 (or 146384 counting only the distinct ones).

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

The square root of 11856861 is about 3443.3792994673. The cubic root of 11856861 is about 228.0289090767.

The spelling of 11856861 in words is "eleven million, eight hundred fifty-six thousand, eight hundred sixty-one".