18805042 has 4 divisors (see below), whose sum is σ = 28207566. Its totient is φ = 9402520.

The previous prime is 18805037. The next prime is 18805049. The reversal of 18805042 is 24050881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24050881 = 929 ⋅25889.

It can be written as a sum of positive squares in only one way, i.e., 12895281 + 5909761 = 3591^2 + 2431^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18805042.

It is not an unprimeable number, because it can be changed into a prime (18805049) 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 as a sum of consecutive naturals, namely, 4701259 + ... + 4701262.

Almost surely, 2^18805042 is an apocalyptic number.

18805042 is a deficient number, since it is larger than the sum of its proper divisors (9402524).

18805042 is an equidigital number, since it uses as much as digits as its factorization.

18805042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9402523.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 18805042 is about 4336.4780640515. The cubic root of 18805042 is about 265.9243476796.

The spelling of 18805042 in words is "eighteen million, eight hundred five thousand, forty-two".