18029809 has 16 divisors (see below), whose sum is σ = 22007808. Its totient is φ = 14418432.

The previous prime is 18029801. The next prime is 18029833. The reversal of 18029809 is 90892081.

It is not a de Polignac number, because 18029809 - 2³ = 18029801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18029801) 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, 14517 + ... + 15709.

It is an arithmetic number, because the mean of its divisors is an integer number (1375488).

Almost surely, 2^18029809 is an apocalyptic number.

It is an amenable number.

18029809 is a deficient number, since it is larger than the sum of its proper divisors (3977999).

18029809 is a wasteful number, since it uses less digits than its factorization.

18029809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 18029809 is about 4246.1522582216. The cubic root of 18029809 is about 262.2187294121.

It can be divided in two parts, 1802 and 9809, that added together give a palindrome (11611).

The spelling of 18029809 in words is "eighteen million, twenty-nine thousand, eight hundred nine".