18375645 has 16 divisors (see below), whose sum is σ = 29678400. Its totient is φ = 9708752.

The previous prime is 18375631. The next prime is 18375677. The reversal of 18375645 is 54657381.

It is not a de Polignac number, because 18375645 - 2⁴ = 18375629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171682 + ... + 171788.

It is an arithmetic number, because the mean of its divisors is an integer number (1854900).

Almost surely, 2^18375645 is an apocalyptic number.

18375645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18375645 is a deficient number, since it is larger than the sum of its proper divisors (11302755).

18375645 is an frugal number, since it uses more digits than its factorization.

18375645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 115 counting only the distinct ones).

The product of its digits is 100800, while the sum is 39.

The square root of 18375645 is about 4286.6822835382. The cubic root of 18375645 is about 263.8846919534.

The spelling of 18375645 in words is "eighteen million, three hundred seventy-five thousand, six hundred forty-five".