18039860 has 12 divisors (see below), whose sum is σ = 37883748. Its totient is φ = 7215936.

The previous prime is 18039823. The next prime is 18039871. The reversal of 18039860 is 6893081.

It can be written as a sum of positive squares in 2 ways, for example, as 13278736 + 4761124 = 3644^2 + 2182^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18039860.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450977 + ... + 451016.

It is an arithmetic number, because the mean of its divisors is an integer number (3156979).

Almost surely, 2^18039860 is an apocalyptic number.

18039860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18039860 is an abundant number, since it is smaller than the sum of its proper divisors (19843888).

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

18039860 is a wasteful number, since it uses less digits than its factorization.

18039860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902002 (or 902000 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 18039860 is about 4247.3356354308. The cubic root of 18039860 is about 262.2674463426.

The spelling of 18039860 in words is "eighteen million, thirty-nine thousand, eight hundred sixty".