18140385 has 16 divisors (see below), whose sum is σ = 29220480. Its totient is φ = 9609600.

The previous prime is 18140371. The next prime is 18140387. The reversal of 18140385 is 58304181.

It is not a de Polignac number, because 18140385 - 2⁶ = 18140321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18140387) 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 15 ways as a sum of consecutive naturals, for example, 1740 + ... + 6269.

It is an arithmetic number, because the mean of its divisors is an integer number (1826280).

Almost surely, 2^18140385 is an apocalyptic number.

18140385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18140385 is a deficient number, since it is larger than the sum of its proper divisors (11080095).

18140385 is a wasteful number, since it uses less digits than its factorization.

18140385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8168.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 18140385 is about 4259.1530848280. The cubic root of 18140385 is about 262.7536957772.

The spelling of 18140385 in words is "eighteen million, one hundred forty thousand, three hundred eighty-five".