18439285 has 4 divisors (see below), whose sum is σ = 22127148. Its totient is φ = 14751424.

The previous prime is 18439279. The next prime is 18439297. The reversal of 18439285 is 58293481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2125764 + 16313521 = 1458^2 + 4039^2 .

It is a cyclic number.

It is not a de Polignac number, because 18439285 - 2³ = 18439277 is a prime.

It is a super-2 number, since 2×18439285² = 680014462622450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1843924 + ... + 1843933.

It is an arithmetic number, because the mean of its divisors is an integer number (5531787).

Almost surely, 2^18439285 is an apocalyptic number.

It is an amenable number.

18439285 is a deficient number, since it is larger than the sum of its proper divisors (3687863).

18439285 is an equidigital number, since it uses as much as digits as its factorization.

18439285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3687862.

The product of its digits is 69120, while the sum is 40.

The square root of 18439285 is about 4294.0988577349. The cubic root of 18439285 is about 264.1889764562.

The spelling of 18439285 in words is "eighteen million, four hundred thirty-nine thousand, two hundred eighty-five".