18870685 has 8 divisors (see below), whose sum is σ = 22677336. Its totient is φ = 15074880.

The previous prime is 18870647. The next prime is 18870689. The reversal of 18870685 is 58607881.

It can be written as a sum of positive squares in 4 ways, for example, as 52441 + 18818244 = 229^2 + 4338^2 .

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

It is not a de Polignac number, because 18870685 - 2¹¹ = 18868637 is a prime.

It is a super-2 number, since 2×18870685² = 712205504738450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18870689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1807 + ... + 6403.

It is an arithmetic number, because the mean of its divisors is an integer number (2834667).

Almost surely, 2^18870685 is an apocalyptic number.

It is an amenable number.

18870685 is a deficient number, since it is larger than the sum of its proper divisors (3806651).

18870685 is an equidigital number, since it uses as much as digits as its factorization.

18870685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5423.

The product of its (nonzero) digits is 107520, while the sum is 43.

The square root of 18870685 is about 4344.0401701642. The cubic root of 18870685 is about 266.2334101796.

The spelling of 18870685 in words is "eighteen million, eight hundred seventy thousand, six hundred eighty-five".