18850505 has 4 divisors (see below), whose sum is σ = 22620612. Its totient is φ = 15080400.

The previous prime is 18850499. The next prime is 18850523. The reversal of 18850505 is 50505881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50505881 = 691 ⋅73091.

It can be written as a sum of positive squares in 2 ways, for example, as 9066121 + 9784384 = 3011^2 + 3128^2 .

It is not a de Polignac number, because 18850505 - 2¹⁴ = 18834121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1885046 + ... + 1885055.

It is an arithmetic number, because the mean of its divisors is an integer number (5655153).

Almost surely, 2^18850505 is an apocalyptic number.

It is an amenable number.

18850505 is a deficient number, since it is larger than the sum of its proper divisors (3770107).

18850505 is an equidigital number, since it uses as much as digits as its factorization.

18850505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770106.

The product of its (nonzero) digits is 8000, while the sum is 32.

The square root of 18850505 is about 4341.7168263257. The cubic root of 18850505 is about 266.1384744547.

The spelling of 18850505 in words is "eighteen million, eight hundred fifty thousand, five hundred five".