18061873 has 2 divisors, whose sum is σ = 18061874. Its totient is φ = 18061872.

The previous prime is 18061859. The next prime is 18061889. The reversal of 18061873 is 37816081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17783089 + 278784 = 4217^2 + 528^2 .

It is a cyclic number.

It is not a de Polignac number, because 18061873 - 2¹³ = 18053681 is a prime.

It is not a weakly prime, because it can be changed into another prime (18061273) 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 as a sum of consecutive naturals, namely, 9030936 + 9030937.

It is an arithmetic number, because the mean of its divisors is an integer number (9030937).

Almost surely, 2^18061873 is an apocalyptic number.

It is an amenable number.

18061873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18061873 is an equidigital number, since it uses as much as digits as its factorization.

18061873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 18061873 is about 4249.9262346540. The cubic root of 18061873 is about 262.3740795909.

The spelling of 18061873 in words is "eighteen million, sixty-one thousand, eight hundred seventy-three".