18750388 has 12 divisors (see below), whose sum is σ = 34743492. Its totient is φ = 8823680.

The previous prime is 18750383. The next prime is 18750421. The reversal of 18750388 is 88305781.

It can be written as a sum of positive squares in 2 ways, for example, as 6091024 + 12659364 = 2468^2 + 3558^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18750388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18750383) 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, 137803 + ... + 137938.

It is an arithmetic number, because the mean of its divisors is an integer number (2895291).

Almost surely, 2^18750388 is an apocalyptic number.

It is an amenable number.

18750388 is a deficient number, since it is larger than the sum of its proper divisors (15993104).

18750388 is a wasteful number, since it uses less digits than its factorization.

18750388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275762 (or 275760 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 18750388 is about 4330.1718210713. The cubic root of 18750388 is about 265.6664747787. Note that the first 3 decimals are identical.

The spelling of 18750388 in words is "eighteen million, seven hundred fifty thousand, three hundred eighty-eight".