18679860 has 72 divisors (see below), whose sum is σ = 57109416. Its totient is φ = 4942080.

The previous prime is 18679823. The next prime is 18679861. The reversal of 18679860 is 6897681.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2471184 + 16208676 = 1572^2 + 4026^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18679861) 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, 27930 + ... + 28590.

Almost surely, 2^18679860 is an apocalyptic number.

18679860 is a gapful number since it is divisible by the number (10) 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 18679860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28554708).

18679860 is an abundant number, since it is smaller than the sum of its proper divisors (38429556).

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

18679860 is a wasteful number, since it uses less digits than its factorization.

18679860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 18679860 is about 4322.0203608960. The cubic root of 18679860 is about 265.3329622704.

It can be divided in two parts, 1 and 8679860, that added together give a triangular number (8679861 = T₄₁₆₆).

The spelling of 18679860 in words is "eighteen million, six hundred seventy-nine thousand, eight hundred sixty".