18289749 has 16 divisors (see below), whose sum is σ = 25819200. Its totient is φ = 11496576.

The previous prime is 18289709. The next prime is 18289751. The reversal of 18289749 is 94798281.

It is not a de Polignac number, because 18289749 - 2¹² = 18285653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18289698 and 18289707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18289709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1297 + ... + 6185.

It is an arithmetic number, because the mean of its divisors is an integer number (1613700).

Almost surely, 2^18289749 is an apocalyptic number.

It is an amenable number.

18289749 is a deficient number, since it is larger than the sum of its proper divisors (7529451).

18289749 is a wasteful number, since it uses less digits than its factorization.

18289749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4964.

The product of its digits is 290304, while the sum is 48.

The square root of 18289749 is about 4276.6516107815. The cubic root of 18289749 is about 263.4728778462.

The spelling of 18289749 in words is "eighteen million, two hundred eighty-nine thousand, seven hundred forty-nine".