18103540 has 120 divisors (see below), whose sum is σ = 49409640. Its totient is φ = 5531904.

The previous prime is 18103537. The next prime is 18103571. The reversal of 18103540 is 4530181.

It can be written as a sum of positive squares in 4 ways, for example, as 345744 + 17757796 = 588^2 + 4214^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 624246 + ... + 624274.

It is an arithmetic number, because the mean of its divisors is an integer number (411747).

Almost surely, 2^18103540 is an apocalyptic number.

18103540 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 18103540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24704820).

18103540 is an abundant number, since it is smaller than the sum of its proper divisors (31306100).

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

18103540 is a wasteful number, since it uses less digits than its factorization.

18103540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18103540 is about 4254.8254958341. The cubic root of 18103540 is about 262.5756818816.

The spelling of 18103540 in words is "eighteen million, one hundred three thousand, five hundred forty".