19994403 has 48 divisors (see below), whose sum is σ = 33367040. Its totient is φ = 10549440.

The previous prime is 19994389. The next prime is 19994407. The reversal of 19994403 is 30449991.

It is not a de Polignac number, because 19994403 - 2⁵ = 19994371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (19994407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 89550 + ... + 89772.

Almost surely, 2^19994403 is an apocalyptic number.

19994403 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19994403 is a deficient number, since it is larger than the sum of its proper divisors (13372637).

19994403 is a wasteful number, since it uses less digits than its factorization.

19994403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 19994403 is about 4471.5101475900. The cubic root of 19994403 is about 271.4164383048.

The spelling of 19994403 in words is "nineteen million, nine hundred ninety-four thousand, four hundred three".