19986903 has 12 divisors (see below), whose sum is σ = 28933320. Its totient is φ = 13295376.

The previous prime is 19986893. The next prime is 19986929. The reversal of 19986903 is 30968991.

It is not a de Polignac number, because 19986903 - 2⁵ = 19986871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19986943) 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, 2400 + ... + 6762.

It is an arithmetic number, because the mean of its divisors is an integer number (2411110).

Almost surely, 2^19986903 is an apocalyptic number.

19986903 is a deficient number, since it is larger than the sum of its proper divisors (8946417).

19986903 is a wasteful number, since it uses less digits than its factorization.

19986903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4878 (or 4875 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 19986903 is about 4470.6714260836. The cubic root of 19986903 is about 271.3824975087.

The spelling of 19986903 in words is "nineteen million, nine hundred eighty-six thousand, nine hundred three".