18787041 has 72 divisors (see below), whose sum is σ = 35479080. Its totient is φ = 9483264.

The previous prime is 18787039. The next prime is 18787049. The reversal of 18787041 is 14078781.

It can be written as a sum of positive squares in 4 ways, for example, as 254016 + 18533025 = 504^2 + 4305^2 .

It is not a de Polignac number, because 18787041 - 2¹ = 18787039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18786987 and 18787005.

It is not an unprimeable number, because it can be changed into a prime (18787049) 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 71 ways as a sum of consecutive naturals, for example, 166201 + ... + 166313.

It is an arithmetic number, because the mean of its divisors is an integer number (492765).

Almost surely, 2^18787041 is an apocalyptic number.

It is an amenable number.

18787041 is a deficient number, since it is larger than the sum of its proper divisors (16692039).

18787041 is a wasteful number, since it uses less digits than its factorization.

18787041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 18787041 is about 4334.4020348832. The cubic root of 18787041 is about 265.8394691595.

The spelling of 18787041 in words is "eighteen million, seven hundred eighty-seven thousand, forty-one".