18105380 has 12 divisors (see below), whose sum is σ = 38021340. Its totient is φ = 7242144.

The previous prime is 18105377. The next prime is 18105401. The reversal of 18105380 is 8350181.

It can be written as a sum of positive squares in 2 ways, for example, as 2534464 + 15570916 = 1592^2 + 3946^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452615 + ... + 452654.

It is an arithmetic number, because the mean of its divisors is an integer number (3168445).

Almost surely, 2^18105380 is an apocalyptic number.

18105380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18105380 is an abundant number, since it is smaller than the sum of its proper divisors (19915960).

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

18105380 is a wasteful number, since it uses less digits than its factorization.

18105380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905278 (or 905276 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 18105380 is about 4255.0417154242. The cubic root of 18105380 is about 262.5845774326.

The spelling of 18105380 in words is "eighteen million, one hundred five thousand, three hundred eighty".