18887005 has 4 divisors (see below), whose sum is σ = 22664412. Its totient is φ = 15109600.

The previous prime is 18886963. The next prime is 18887009. The reversal of 18887005 is 50078881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50078881 = 2411 ⋅20771.

It can be written as a sum of positive squares in 2 ways, for example, as 12766329 + 6120676 = 3573^2 + 2474^2 .

It is not a de Polignac number, because 18887005 - 2¹⁵ = 18854237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18887009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1888696 + ... + 1888705.

It is an arithmetic number, because the mean of its divisors is an integer number (5666103).

Almost surely, 2^18887005 is an apocalyptic number.

It is an amenable number.

18887005 is a deficient number, since it is larger than the sum of its proper divisors (3777407).

18887005 is an equidigital number, since it uses as much as digits as its factorization.

18887005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3777406.

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 18887005 is about 4345.9181998745. The cubic root of 18887005 is about 266.3101372531.

The spelling of 18887005 in words is "eighteen million, eight hundred eighty-seven thousand, five".