19909799 has 16 divisors (see below), whose sum is σ = 24698688. Its totient is φ = 15628032.

The previous prime is 19909793. The next prime is 19909823. The reversal of 19909799 is 99790991.

It is not a de Polignac number, because 19909799 - 2¹⁶ = 19844263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19909799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19909793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11669 + ... + 13265.

It is an arithmetic number, because the mean of its divisors is an integer number (1543668).

Almost surely, 2^19909799 is an apocalyptic number.

19909799 is a deficient number, since it is larger than the sum of its proper divisors (4788889).

19909799 is a wasteful number, since it uses less digits than its factorization.

19909799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754.

The product of its (nonzero) digits is 413343, while the sum is 53.

The square root of 19909799 is about 4462.0397801902. The cubic root of 19909799 is about 271.0330746704.

The spelling of 19909799 in words is "nineteen million, nine hundred nine thousand, seven hundred ninety-nine".