18139845 has 32 divisors (see below), whose sum is σ = 29952000. Its totient is φ = 9370944.

The previous prime is 18139811. The next prime is 18139859. The reversal of 18139845 is 54893181.

It is not a de Polignac number, because 18139845 - 2¹¹ = 18137797 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 (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91056 + ... + 91254.

It is an arithmetic number, because the mean of its divisors is an integer number (936000).

Almost surely, 2^18139845 is an apocalyptic number.

18139845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18139845 is a deficient number, since it is larger than the sum of its proper divisors (11812155).

18139845 is a wasteful number, since it uses less digits than its factorization.

18139845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369.

The product of its digits is 34560, while the sum is 39.

The square root of 18139845 is about 4259.0896914716. The cubic root of 18139845 is about 262.7510885484.

The spelling of 18139845 in words is "eighteen million, one hundred thirty-nine thousand, eight hundred forty-five".