18389285 has 4 divisors (see below), whose sum is σ = 22067148. Its totient is φ = 14711424.

The previous prime is 18389263. The next prime is 18389299. The reversal of 18389285 is 58298381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58298381 = 29 ⋅2010289.

It can be written as a sum of positive squares in 2 ways, for example, as 9821956 + 8567329 = 3134^2 + 2927^2 .

It is a cyclic number.

It is not a de Polignac number, because 18389285 - 2⁶ = 18389221 is a prime.

It is a super-2 number, since 2×18389285² = 676331605622450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1838924 + ... + 1838933.

It is an arithmetic number, because the mean of its divisors is an integer number (5516787).

Almost surely, 2^18389285 is an apocalyptic number.

It is an amenable number.

18389285 is a deficient number, since it is larger than the sum of its proper divisors (3677863).

18389285 is an equidigital number, since it uses as much as digits as its factorization.

18389285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3677862.

The product of its digits is 138240, while the sum is 44.

The square root of 18389285 is about 4288.2729623941. The cubic root of 18389285 is about 263.9499685187.

The spelling of 18389285 in words is "eighteen million, three hundred eighty-nine thousand, two hundred eighty-five".