18770845 has 4 divisors (see below), whose sum is σ = 22525020. Its totient is φ = 15016672.

The previous prime is 18770837. The next prime is 18770849. The reversal of 18770845 is 54807781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4618201 + 14152644 = 2149^2 + 3762^2 .

It is a cyclic number.

It is not a de Polignac number, because 18770845 - 2³ = 18770837 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 = 18770798 and 18770807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18770849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1877080 + ... + 1877089.

It is an arithmetic number, because the mean of its divisors is an integer number (5631255).

Almost surely, 2^18770845 is an apocalyptic number.

It is an amenable number.

18770845 is a deficient number, since it is larger than the sum of its proper divisors (3754175).

18770845 is an equidigital number, since it uses as much as digits as its factorization.

18770845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3754174.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 18770845 is about 4332.5333235879. The cubic root of 18770845 is about 265.7630552478.

The spelling of 18770845 in words is "eighteen million, seven hundred seventy thousand, eight hundred forty-five".