18039105 has 84 divisors (see below), whose sum is σ = 38128212. Its totient is φ = 8164800.

The previous prime is 18039079. The next prime is 18039127. The reversal of 18039105 is 50193081.

It can be written as a sum of positive squares in 2 ways, for example, as 12895281 + 5143824 = 3591^2 + 2268^2 .

It is not a de Polignac number, because 18039105 - 2⁹ = 18038593 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 178555 + ... + 178655.

Almost surely, 2^18039105 is an apocalyptic number.

18039105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18039105 is an abundant number, since it is smaller than the sum of its proper divisors (20089107).

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

18039105 is an equidigital number, since it uses as much as digits as its factorization.

18039105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 18039105 is about 4247.2467552522. The cubic root of 18039105 is about 262.2637875063.

The spelling of 18039105 in words is "eighteen million, thirty-nine thousand, one hundred five".