18989803 has 12 divisors (see below), whose sum is σ = 22170720. Its totient is φ = 16217712.

The previous prime is 18989791. The next prime is 18989807. The reversal of 18989803 is 30898981.

It is not a de Polignac number, because 18989803 - 2⁹ = 18989291 is a prime.

It is a super-2 number, since 2×18989803² = 721225235957618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18989807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17758 + ... + 18796.

It is an arithmetic number, because the mean of its divisors is an integer number (1847560).

Almost surely, 2^18989803 is an apocalyptic number.

18989803 is a deficient number, since it is larger than the sum of its proper divisors (3180917).

18989803 is a wasteful number, since it uses less digits than its factorization.

18989803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426 (or 1419 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 18989803 is about 4357.7291104427. The cubic root of 18989803 is about 266.7924200288.

The spelling of 18989803 in words is "eighteen million, nine hundred eighty-nine thousand, eight hundred three".