18285140 has 12 divisors (see below), whose sum is σ = 38398836. Its totient is φ = 7314048.

The previous prime is 18285121. The next prime is 18285143. The reversal of 18285140 is 4158281.

It can be written as a sum of positive squares in 2 ways, for example, as 9909904 + 8375236 = 3148^2 + 2894^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18285143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457109 + ... + 457148.

It is an arithmetic number, because the mean of its divisors is an integer number (3199903).

Almost surely, 2^18285140 is an apocalyptic number.

18285140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18285140 is an abundant number, since it is smaller than the sum of its proper divisors (20113696).

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

18285140 is a wasteful number, since it uses less digits than its factorization.

18285140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914266 (or 914264 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 18285140 is about 4276.1127206845. The cubic root of 18285140 is about 263.4507443456.

The spelling of 18285140 in words is "eighteen million, two hundred eighty-five thousand, one hundred forty".