18750403 has 4 divisors (see below), whose sum is σ = 21429040. Its totient is φ = 16071768.

The previous prime is 18750383. The next prime is 18750421. The reversal of 18750403 is 30405781.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18750403 is a prime.

It is a super-2 number, since 2×18750403² = 703155225324818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18750493) 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, 1339308 + ... + 1339321.

It is an arithmetic number, because the mean of its divisors is an integer number (5357260).

Almost surely, 2^18750403 is an apocalyptic number.

18750403 is a deficient number, since it is larger than the sum of its proper divisors (2678637).

18750403 is an equidigital number, since it uses as much as digits as its factorization.

18750403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678636.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 18750403 is about 4330.1735531038. The cubic root of 18750403 is about 265.6665456216. Note that the first 3 decimals are identical.

The spelling of 18750403 in words is "eighteen million, seven hundred fifty thousand, four hundred three".