18390345 has 32 divisors (see below), whose sum is σ = 31933440. Its totient is φ = 9000960.

The previous prime is 18390343. The next prime is 18390353. The reversal of 18390345 is 54309381.

It is not a de Polignac number, because 18390345 - 2¹ = 18390343 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18390343) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 9576 + ... + 11334.

It is an arithmetic number, because the mean of its divisors is an integer number (997920).

Almost surely, 2^18390345 is an apocalyptic number.

18390345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18390345 is a deficient number, since it is larger than the sum of its proper divisors (13543095).

18390345 is a wasteful number, since it uses less digits than its factorization.

18390345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 18390345 is about 4288.3965534918. The cubic root of 18390345 is about 263.9550399790.

The spelling of 18390345 in words is "eighteen million, three hundred ninety thousand, three hundred forty-five".