18706445 has 8 divisors (see below), whose sum is σ = 22521336. Its totient is φ = 14916096.

The previous prime is 18706439. The next prime is 18706447. The reversal of 18706445 is 54460781.

It can be written as a sum of positive squares in 4 ways, for example, as 779689 + 17926756 = 883^2 + 4234^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18706445 - 2¹² = 18702349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18706447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4412 + ... + 7541.

It is an arithmetic number, because the mean of its divisors is an integer number (2815167).

Almost surely, 2^18706445 is an apocalyptic number.

It is an amenable number.

18706445 is a deficient number, since it is larger than the sum of its proper divisors (3814891).

18706445 is a wasteful number, since it uses less digits than its factorization.

18706445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12271.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 18706445 is about 4325.0947966490. The cubic root of 18706445 is about 265.4587757241.

The spelling of 18706445 in words is "eighteen million, seven hundred six thousand, four hundred forty-five".