18189743 has 16 divisors (see below), whose sum is σ = 21555072. Its totient is φ = 15132000.

The previous prime is 18189727. The next prime is 18189751. The reversal of 18189743 is 34798181.

It is not a de Polignac number, because 18189743 - 2⁴ = 18189727 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18189743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18189713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18248 + ... + 19218.

It is an arithmetic number, because the mean of its divisors is an integer number (1347192).

Almost surely, 2^18189743 is an apocalyptic number.

18189743 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18189743 is a deficient number, since it is larger than the sum of its proper divisors (3365329).

18189743 is a wasteful number, since it uses less digits than its factorization.

18189743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126.

The product of its digits is 48384, while the sum is 41.

The square root of 18189743 is about 4264.9434931778. The cubic root of 18189743 is about 262.9917879724.

The spelling of 18189743 in words is "eighteen million, one hundred eighty-nine thousand, seven hundred forty-three".