18855039 has 32 divisors (see below), whose sum is σ = 29998080. Its totient is φ = 10310400.

The previous prime is 18855029. The next prime is 18855041. The reversal of 18855039 is 93055881.

It is not a de Polignac number, because 18855039 - 2¹³ = 18846847 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18854988 and 18855006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18855029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52342 + ... + 52700.

It is an arithmetic number, because the mean of its divisors is an integer number (937440).

Almost surely, 2^18855039 is an apocalyptic number.

18855039 is a deficient number, since it is larger than the sum of its proper divisors (11143041).

18855039 is a wasteful number, since it uses less digits than its factorization.

18855039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 18855039 is about 4342.2389386122. The cubic root of 18855039 is about 266.1598103130.

The spelling of 18855039 in words is "eighteen million, eight hundred fifty-five thousand, thirty-nine".