18785380 has 48 divisors (see below), whose sum is σ = 41771520. Its totient is φ = 7084800.

The previous prime is 18785369. The next prime is 18785407. The reversal of 18785380 is 8358781.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25051 + ... + 25789.

It is an arithmetic number, because the mean of its divisors is an integer number (870240).

Almost surely, 2^18785380 is an apocalyptic number.

18785380 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 18785380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20885760).

18785380 is an abundant number, since it is smaller than the sum of its proper divisors (22986140).

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

18785380 is a wasteful number, since it uses less digits than its factorization.

18785380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 18785380 is about 4334.2104240565. The cubic root of 18785380 is about 265.8316344616.

The spelling of 18785380 in words is "eighteen million, seven hundred eighty-five thousand, three hundred eighty".