18870605 has 8 divisors (see below), whose sum is σ = 24386712. Its totient is φ = 13935168.

The previous prime is 18870589. The next prime is 18870611. The reversal of 18870605 is 50607881.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 320356 + 18550249 = 566^2 + 4307^2 .

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

It is not a de Polignac number, because 18870605 - 2⁴ = 18870589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent 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, 145094 + ... + 145223.

It is an arithmetic number, because the mean of its divisors is an integer number (3048339).

Almost surely, 2^18870605 is an apocalyptic number.

It is an amenable number.

18870605 is a deficient number, since it is larger than the sum of its proper divisors (5516107).

18870605 is a wasteful number, since it uses less digits than its factorization.

18870605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290335.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 18870605 is about 4344.0309621364. The cubic root of 18870605 is about 266.2330339575.

The spelling of 18870605 in words is "eighteen million, eight hundred seventy thousand, six hundred five".