18769745 has 4 divisors (see below), whose sum is σ = 22523700. Its totient is φ = 15015792.

The previous prime is 18769741. The next prime is 18769747. The reversal of 18769745 is 54796781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10452289 + 8317456 = 3233^2 + 2884^2 .

It is a cyclic number.

It is not a de Polignac number, because 18769745 - 2² = 18769741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18769745.

It is not an unprimeable number, because it can be changed into a prime (18769741) 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 3 ways as a sum of consecutive naturals, for example, 1876970 + ... + 1876979.

It is an arithmetic number, because the mean of its divisors is an integer number (5630925).

Almost surely, 2^18769745 is an apocalyptic number.

It is an amenable number.

18769745 is a deficient number, since it is larger than the sum of its proper divisors (3753955).

18769745 is an equidigital number, since it uses as much as digits as its factorization.

18769745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753954.

The product of its digits is 423360, while the sum is 47.

The square root of 18769745 is about 4332.4063752146. The cubic root of 18769745 is about 265.7578637736.

The spelling of 18769745 in words is "eighteen million, seven hundred sixty-nine thousand, seven hundred forty-five".