18381075 has 24 divisors (see below), whose sum is σ = 31992000. Its totient is φ = 9286560.

The previous prime is 18381059. The next prime is 18381107. The reversal of 18381075 is 57018381.

It is not a de Polignac number, because 18381075 - 2⁴ = 18381059 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5025 + ... + 7874.

It is an arithmetic number, because the mean of its divisors is an integer number (1333000).

Almost surely, 2^18381075 is an apocalyptic number.

18381075 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18381075 is a deficient number, since it is larger than the sum of its proper divisors (13610925).

18381075 is a wasteful number, since it uses less digits than its factorization.

18381075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12931 (or 12926 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 18381075 is about 4287.3155937020. The cubic root of 18381075 is about 263.9106820208.

The spelling of 18381075 in words is "eighteen million, three hundred eighty-one thousand, seventy-five".