18118590 has 96 divisors (see below), whose sum is σ = 52669440. Its totient is φ = 3907008.

The previous prime is 18118589. The next prime is 18118603. The reversal of 18118590 is 9581181.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 75691 + ... + 75929.

It is an arithmetic number, because the mean of its divisors is an integer number (548640).

Almost surely, 2^18118590 is an apocalyptic number.

18118590 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 18118590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26334720).

18118590 is an abundant number, since it is smaller than the sum of its proper divisors (34550850).

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

18118590 is a wasteful number, since it uses less digits than its factorization.

18118590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 33.

The square root of 18118590 is about 4256.5937085891. The cubic root of 18118590 is about 262.6484239981.

It can be divided in two parts, 1811 and 8590, that added together give a palindrome (10401).

The spelling of 18118590 in words is "eighteen million, one hundred eighteen thousand, five hundred ninety".