18680845 has 4 divisors (see below), whose sum is σ = 22417020. Its totient is φ = 14944672.

The previous prime is 18680803. The next prime is 18680861. The reversal of 18680845 is 54808681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54808681 = 1759 ⋅31159.

It can be written as a sum of positive squares in 2 ways, for example, as 7518564 + 11162281 = 2742^2 + 3341^2 .

It is a cyclic number.

It is not a de Polignac number, because 18680845 - 2¹¹ = 18678797 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18680798 and 18680807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1868080 + ... + 1868089.

It is an arithmetic number, because the mean of its divisors is an integer number (5604255).

Almost surely, 2^18680845 is an apocalyptic number.

It is an amenable number.

18680845 is a deficient number, since it is larger than the sum of its proper divisors (3736175).

18680845 is an equidigital number, since it uses as much as digits as its factorization.

18680845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3736174.

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 18680845 is about 4322.1343107312. The cubic root of 18680845 is about 265.3376259094.

The spelling of 18680845 in words is "eighteen million, six hundred eighty thousand, eight hundred forty-five".