18010890 has 64 divisors (see below), whose sum is σ = 49230720. Its totient is φ = 4682880.

The previous prime is 18010877. The next prime is 18010891. The reversal of 18010890 is 9801081.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18010891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10257 + ... + 11883.

It is an arithmetic number, because the mean of its divisors is an integer number (769230).

Almost surely, 2^18010890 is an apocalyptic number.

18010890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18010890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24615360).

18010890 is an abundant number, since it is smaller than the sum of its proper divisors (31219830).

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

18010890 is a wasteful number, since it uses less digits than its factorization.

18010890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684 (or 1678 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 18010890 is about 4243.9238918718. The cubic root of 18010890 is about 262.1269803842.

The spelling of 18010890 in words is "eighteen million, ten thousand, eight hundred ninety".