18985403 has 8 divisors (see below), whose sum is σ = 19953648. Its totient is φ = 18041184.

The previous prime is 18985397. The next prime is 18985409. The reversal of 18985403 is 30458981.

It is an interprime number because it is at equal distance from previous prime (18985397) and next prime (18985409).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18985403 - 2⁴ = 18985387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18985409) 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 7 ways as a sum of consecutive naturals, for example, 4376 + ... + 7557.

It is an arithmetic number, because the mean of its divisors is an integer number (2494206).

Almost surely, 2^18985403 is an apocalyptic number.

18985403 is a deficient number, since it is larger than the sum of its proper divisors (968245).

18985403 is a wasteful number, since it uses less digits than its factorization.

18985403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12013.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 18985403 is about 4357.2242310902. The cubic root of 18985403 is about 266.7718128759.

The spelling of 18985403 in words is "eighteen million, nine hundred eighty-five thousand, four hundred three".