18145505 has 16 divisors (see below), whose sum is σ = 25968384. Its totient is φ = 11901120.

The previous prime is 18145489. The next prime is 18145529. The reversal of 18145505 is 50554181.

It is not a de Polignac number, because 18145505 - 2⁴ = 18145489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10466 + ... + 12075.

It is an arithmetic number, because the mean of its divisors is an integer number (1623024).

Almost surely, 2^18145505 is an apocalyptic number.

It is an amenable number.

18145505 is a deficient number, since it is larger than the sum of its proper divisors (7822879).

18145505 is a wasteful number, since it uses less digits than its factorization.

18145505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22576.

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 18145505 is about 4259.7541008842. The cubic root of 18145505 is about 262.7784135984.

Adding to 18145505 its reverse (50554181), we get a palindrome (68699686).

The spelling of 18145505 in words is "eighteen million, one hundred forty-five thousand, five hundred five".