18012845 has 16 divisors (see below), whose sum is σ = 22274352. Its totient is φ = 13977600.

The previous prime is 18012793. The next prime is 18012847. The reversal of 18012845 is 54821081.

It can be written as a sum of positive squares in 8 ways, for example, as 1087849 + 16924996 = 1043^2 + 4114^2 .

It is not a de Polignac number, because 18012845 - 2¹⁰ = 18011821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26429 + ... + 27101.

It is an arithmetic number, because the mean of its divisors is an integer number (1392147).

Almost surely, 2^18012845 is an apocalyptic number.

It is an amenable number.

18012845 is a deficient number, since it is larger than the sum of its proper divisors (4261507).

18012845 is a wasteful number, since it uses less digits than its factorization.

18012845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 18012845 is about 4244.1542149173. The cubic root of 18012845 is about 262.1364642706.

The spelling of 18012845 in words is "eighteen million, twelve thousand, eight hundred forty-five".