18870705 has 64 divisors (see below), whose sum is σ = 40396800. Its totient is φ = 8164800.

The previous prime is 18870689. The next prime is 18870707. The reversal of 18870705 is 50707881.

It is not a de Polignac number, because 18870705 - 2⁴ = 18870689 is a prime.

It is a super-2 number, since 2×18870705² = 712207014394050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18870705.

It is not an unprimeable number, because it can be changed into a prime (18870707) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17430 + ... + 18480.

It is an arithmetic number, because the mean of its divisors is an integer number (631200).

Almost surely, 2^18870705 is an apocalyptic number.

18870705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18870705 is an abundant number, since it is smaller than the sum of its proper divisors (21526095).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18870705 is a wasteful number, since it uses less digits than its factorization.

18870705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091 (or 1085 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

The square root of 18870705 is about 4344.0424721681. The cubic root of 18870705 is about 266.2335042349.

The spelling of 18870705 in words is "eighteen million, eight hundred seventy thousand, seven hundred five".