18500505 has 16 divisors (see below), whose sum is σ = 31342464. Its totient is φ = 9286400.

The previous prime is 18500501. The next prime is 18500527. The reversal of 18500505 is 50500581.

It is not a de Polignac number, because 18500505 - 2² = 18500501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18500501) 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, 36021 + ... + 36530.

It is an arithmetic number, because the mean of its divisors is an integer number (1958904).

Almost surely, 2^18500505 is an apocalyptic number.

18500505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18500505 is a deficient number, since it is larger than the sum of its proper divisors (12841959).

18500505 is a wasteful number, since it uses less digits than its factorization.

18500505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72576.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 18500505 is about 4301.2213381783. The cubic root of 18500505 is about 264.4810301300.

The spelling of 18500505 in words is "eighteen million, five hundred thousand, five hundred five".