18285733 has 12 divisors (see below), whose sum is σ = 19834860. Its totient is φ = 16855128.

The previous prime is 18285703. The next prime is 18285763. The reversal of 18285733 is 33758281.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an interprime number because it is at equal distance from previous prime (18285703) and next prime (18285763).

It can be written as a sum of positive squares in 2 ways, for example, as 14152644 + 4133089 = 3762^2 + 2033^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18285733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

Its product of digits (40320) is a multiple of the sum of its prime divisors (56).

It is a junction number, because it is equal to n+sod(n) for n = 18285692 and 18285701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18285703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 494191 + ... + 494227.

It is an arithmetic number, because the mean of its divisors is an integer number (1652905).

Almost surely, 2^18285733 is an apocalyptic number.

It is an amenable number.

18285733 is a deficient number, since it is larger than the sum of its proper divisors (1549127).

18285733 is an frugal number, since it uses more digits than its factorization.

18285733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 56 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 18285733 is about 4276.1820587996. The cubic root of 18285733 is about 263.4535922794.

Multiplying 18285733 by its sum of digits (37), we get a square (676572121 = 26011²).

18285733 divided by its sum of digits (37) gives a square (494209 = 703²).

The spelling of 18285733 in words is "eighteen million, two hundred eighty-five thousand, seven hundred thirty-three".