18041689 has 4 divisors (see below), whose sum is σ = 18065124. Its totient is φ = 18018256.

The previous prime is 18041671. The next prime is 18041711. The reversal of 18041689 is 98614081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98614081 = 3259 ⋅30259.

It can be written as a sum of positive squares in 2 ways, for example, as 6718464 + 11323225 = 2592^2 + 3365^2 .

It is a cyclic number.

It is not a de Polignac number, because 18041689 - 2¹¹ = 18039641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18041609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10522 + ... + 12115.

It is an arithmetic number, because the mean of its divisors is an integer number (4516281).

Almost surely, 2^18041689 is an apocalyptic number.

It is an amenable number.

18041689 is a deficient number, since it is larger than the sum of its proper divisors (23435).

18041689 is an equidigital number, since it uses as much as digits as its factorization.

18041689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23434.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18041689 is about 4247.5509414250. The cubic root of 18041689 is about 262.2763095109.

The spelling of 18041689 in words is "eighteen million, forty-one thousand, six hundred eighty-nine".