18806845 has 16 divisors (see below), whose sum is σ = 24152688. Its totient is φ = 14008320.

The previous prime is 18806831. The next prime is 18806861. The reversal of 18806845 is 54860881.

18806845 = 3066² + 3067².

It can be written as a sum of positive squares in 8 ways, for example, as 196249 + 18610596 = 443^2 + 4314^2 .

It is not a de Polignac number, because 18806845 - 2⁵ = 18806813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18806798 and 18806807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7105 + ... + 9385.

It is an arithmetic number, because the mean of its divisors is an integer number (1509543).

Almost surely, 2^18806845 is an apocalyptic number.

18806845 is the 3067-th centered square number.

It is an amenable number.

18806845 is a deficient number, since it is larger than the sum of its proper divisors (5345843).

18806845 is a wasteful number, since it uses less digits than its factorization.

18806845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400.

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

The square root of 18806845 is about 4336.6859466648. The cubic root of 18806845 is about 265.9328462209.

The spelling of 18806845 in words is "eighteen million, eight hundred six thousand, eight hundred forty-five".