19869913 has 16 divisors (see below), whose sum is σ = 23417856. Its totient is φ = 16506000.

The previous prime is 19869893. The next prime is 19869917. The reversal of 19869913 is 31996891.

It is not a de Polignac number, because 19869913 - 2⁵ = 19869881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19869917) 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 15 ways as a sum of consecutive naturals, for example, 75420 + ... + 75682.

It is an arithmetic number, because the mean of its divisors is an integer number (1463616).

Almost surely, 2^19869913 is an apocalyptic number.

It is an amenable number.

19869913 is a deficient number, since it is larger than the sum of its proper divisors (3547943).

19869913 is a wasteful number, since it uses less digits than its factorization.

19869913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564.

The product of its digits is 104976, while the sum is 46.

The square root of 19869913 is about 4457.5680589308. The cubic root of 19869913 is about 270.8519636467.

The spelling of 19869913 in words is "nineteen million, eight hundred sixty-nine thousand, nine hundred thirteen".