18750478 has 4 divisors (see below), whose sum is σ = 28125720. Its totient is φ = 9375238.

The previous prime is 18750469. The next prime is 18750493. The reversal of 18750478 is 87405781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87405781 = 4903 ⋅17827.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18750478.

It is a congruent number.

It is an unprimeable number.

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, 4687618 + ... + 4687621.

It is an arithmetic number, because the mean of its divisors is an integer number (7031430).

Almost surely, 2^18750478 is an apocalyptic number.

18750478 is a deficient number, since it is larger than the sum of its proper divisors (9375242).

18750478 is an equidigital number, since it uses as much as digits as its factorization.

18750478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9375241.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 18750478 is about 4330.1822132562. The cubic root of 18750478 is about 265.6668998356. Note that the first 3 decimals are identical.

The spelling of 18750478 in words is "eighteen million, seven hundred fifty thousand, four hundred seventy-eight".