18935140 has 48 divisors (see below), whose sum is σ = 45730944. Its totient is φ = 6451200.

The previous prime is 18935117. The next prime is 18935159. The reversal of 18935140 is 4153981.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

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, 29220 + ... + 29860.

It is an arithmetic number, because the mean of its divisors is an integer number (952728).

Almost surely, 2^18935140 is an apocalyptic number.

18935140 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 18935140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22865472).

18935140 is an abundant number, since it is smaller than the sum of its proper divisors (26795804).

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

18935140 is a wasteful number, since it uses less digits than its factorization.

18935140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868 (or 866 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 18935140 is about 4351.4526310187. The cubic root of 18935140 is about 266.5361826904.

The spelling of 18935140 in words is "eighteen million, nine hundred thirty-five thousand, one hundred forty".