19899941 has 4 divisors (see below), whose sum is σ = 20323392. Its totient is φ = 19476492.

The previous prime is 19899889. The next prime is 19899947. The reversal of 19899941 is 14999891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14999891 = 41 ⋅365851.

It is a cyclic number.

It is not a de Polignac number, because 19899941 - 2¹⁰ = 19898917 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 19899941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19899947) 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 3 ways as a sum of consecutive naturals, for example, 211655 + ... + 211748.

It is an arithmetic number, because the mean of its divisors is an integer number (5080848).

Almost surely, 2^19899941 is an apocalyptic number.

It is an amenable number.

19899941 is a deficient number, since it is larger than the sum of its proper divisors (423451).

19899941 is an equidigital number, since it uses as much as digits as its factorization.

19899941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423450.

The product of its digits is 209952, while the sum is 50.

The square root of 19899941 is about 4460.9349916806. The cubic root of 19899941 is about 270.9883348056.

Subtracting from 19899941 its sum of digits (50), we obtain a palindrome (19899891).

The spelling of 19899941 in words is "nineteen million, eight hundred ninety-nine thousand, nine hundred forty-one".