19899403 has 12 divisors (see below), whose sum is σ = 21183600. Its totient is φ = 18689616.

The previous prime is 19899353. The next prime is 19899437. The reversal of 19899403 is 30499891.

It is a de Polignac number, because none of the positive numbers 2^k-19899403 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19899403.

It is not an unprimeable number, because it can be changed into a prime (19899443) 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, 71701 + ... + 71977.

It is an arithmetic number, because the mean of its divisors is an integer number (1765300).

Almost surely, 2^19899403 is an apocalyptic number.

19899403 is a deficient number, since it is larger than the sum of its proper divisors (1284197).

19899403 is a wasteful number, since it uses less digits than its factorization.

19899403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 495 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 19899403 is about 4460.8746900132. The cubic root of 19899403 is about 270.9858927039.

It can be divided in two parts, 19899 and 403, that added together give a palindrome (20302).

The spelling of 19899403 in words is "nineteen million, eight hundred ninety-nine thousand, four hundred three".