18019505 has 40 divisors (see below), whose sum is σ = 26889600. Its totient is φ = 11557728.

The previous prime is 18019499. The next prime is 18019531. The reversal of 18019505 is 50591081.

It is not a de Polignac number, because 18019505 - 2⁴ = 18019489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 228056 + ... + 228134.

It is an arithmetic number, because the mean of its divisors is an integer number (672240).

Almost surely, 2^18019505 is an apocalyptic number.

It is an amenable number.

18019505 is a deficient number, since it is larger than the sum of its proper divisors (8870095).

18019505 is an frugal number, since it uses more digits than its factorization.

18019505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 18019505 is about 4244.9387510305. The cubic root of 18019505 is about 262.1687673989.

The spelling of 18019505 in words is "eighteen million, nineteen thousand, five hundred five".