12018861 has 10 divisors (see below), whose sum is σ = 17954222. Its totient is φ = 8012520.

The previous prime is 12018841. The next prime is 12018869. The reversal of 12018861 is 16881021.

It can be written as a sum of positive squares in only one way, i.e., 7733961 + 4284900 = 2781^2 + 2070^2 .

It is not a de Polignac number, because 12018861 - 2⁷ = 12018733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12018869) 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, 74110 + ... + 74271.

Almost surely, 2^12018861 is an apocalyptic number.

It is an amenable number.

12018861 is a deficient number, since it is larger than the sum of its proper divisors (5935361).

12018861 is an equidigital number, since it uses as much as digits as its factorization.

12018861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148393 (or 148384 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 12018861 is about 3466.8228971206. The cubic root of 12018861 is about 229.0627326973.

Adding to 12018861 its reverse (16881021), we get a palindrome (28899882).

It can be divided in two parts, 120 and 18861, that added together give a palindrome (18981).

The spelling of 12018861 in words is "twelve million, eighteen thousand, eight hundred sixty-one".