18209073 has 4 divisors (see below), whose sum is σ = 24278768. Its totient is φ = 12139380.

The previous prime is 18209063. The next prime is 18209099. The reversal of 18209073 is 37090281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18209073 - 2²² = 14014769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18209073.

It is not an unprimeable number, because it can be changed into a prime (18209033) 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, 3034843 + ... + 3034848.

It is an arithmetic number, because the mean of its divisors is an integer number (6069692).

Almost surely, 2^18209073 is an apocalyptic number.

It is an amenable number.

18209073 is a deficient number, since it is larger than the sum of its proper divisors (6069695).

18209073 is an equidigital number, since it uses as much as digits as its factorization.

18209073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6069694.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 18209073 is about 4267.2090410478. The cubic root of 18209073 is about 263.0849142937.

The spelling of 18209073 in words is "eighteen million, two hundred nine thousand, seventy-three".