18861012 has 60 divisors (see below), whose sum is σ = 51470496. Its totient is φ = 6011280.

The previous prime is 18860999. The next prime is 18861019. The reversal of 18861012 is 21016881.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18861019) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6187 + ... + 8717.

Almost surely, 2^18861012 is an apocalyptic number.

18861012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18861012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25735248).

18861012 is an abundant number, since it is smaller than the sum of its proper divisors (32609484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18861012 is a wasteful number, since it uses less digits than its factorization.

18861012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570 (or 2559 counting only the distinct ones).

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

The square root of 18861012 is about 4342.9266629774. The cubic root of 18861012 is about 266.1879125214.

Adding to 18861012 its reverse (21016881), we get a palindrome (39877893).

The spelling of 18861012 in words is "eighteen million, eight hundred sixty-one thousand, twelve".