18669903 has 8 divisors (see below), whose sum is σ = 28449408. Its totient is φ = 10668504.

The previous prime is 18669899. The next prime is 18669907. The reversal of 18669903 is 30996681.

It is an interprime number because it is at equal distance from previous prime (18669899) and next prime (18669907).

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

It is not a de Polignac number, because 18669903 - 2² = 18669899 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18669907) 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, 444501 + ... + 444542.

It is an arithmetic number, because the mean of its divisors is an integer number (3556176).

Almost surely, 2^18669903 is an apocalyptic number.

18669903 is a deficient number, since it is larger than the sum of its proper divisors (9779505).

18669903 is an equidigital number, since it uses as much as digits as its factorization.

18669903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889053.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 18669903 is about 4320.8683155125. The cubic root of 18669903 is about 265.2858100637.

The spelling of 18669903 in words is "eighteen million, six hundred sixty-nine thousand, nine hundred three".