18285047 has 16 divisors (see below), whose sum is σ = 21256992. Its totient is φ = 15544320.

The previous prime is 18285031. The next prime is 18285061. The reversal of 18285047 is 74058281.

It is not a de Polignac number, because 18285047 - 2⁴ = 18285031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18284998 and 18285016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18285097) by changing a digit.

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, 51623 + ... + 51975.

It is an arithmetic number, because the mean of its divisors is an integer number (1328562).

Almost surely, 2^18285047 is an apocalyptic number.

18285047 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18285047 is a deficient number, since it is larger than the sum of its proper divisors (2971945).

18285047 is a wasteful number, since it uses less digits than its factorization.

18285047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 18285047 is about 4276.1018463082. The cubic root of 18285047 is about 263.4502976995.

The spelling of 18285047 in words is "eighteen million, two hundred eighty-five thousand, forty-seven".