18144505 has 8 divisors (see below), whose sum is σ = 21796992. Its totient is φ = 14499888.

The previous prime is 18144481. The next prime is 18144521. The reversal of 18144505 is 50544181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18144505 - 2¹⁷ = 18013433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6192 + ... + 8638.

It is an arithmetic number, because the mean of its divisors is an integer number (2724624).

Almost surely, 2^18144505 is an apocalyptic number.

It is an amenable number.

18144505 is a deficient number, since it is larger than the sum of its proper divisors (3652487).

18144505 is a wasteful number, since it uses less digits than its factorization.

18144505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3935.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 18144505 is about 4259.6367215996. The cubic root of 18144505 is about 262.7735862644.

Adding to 18144505 its reverse (50544181), we get a palindrome (68688686).

The spelling of 18144505 in words is "eighteen million, one hundred forty-four thousand, five hundred five".