18285890 has 32 divisors (see below), whose sum is σ = 37808640. Its totient is φ = 6237504.

The previous prime is 18285889. The next prime is 18285919. The reversal of 18285890 is 9858281.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16184 + ... + 17276.

It is an arithmetic number, because the mean of its divisors is an integer number (1181520).

Almost surely, 2^18285890 is an apocalyptic number.

18285890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18285890 is an abundant number, since it is smaller than the sum of its proper divisors (19522750).

18285890 is a wasteful number, since it uses less digits than its factorization.

18285890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 18285890 is about 4276.2004162574. The cubic root of 18285890 is about 263.4543462751.

The spelling of 18285890 in words is "eighteen million, two hundred eighty-five thousand, eight hundred ninety".