19939117 has 16 divisors (see below), whose sum is σ = 22296384. Its totient is φ = 17680000.

The previous prime is 19939111. The next prime is 19939121. The reversal of 19939117 is 71193991.

It is a cyclic number.

It is not a de Polignac number, because 19939117 - 2¹¹ = 19937069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19939117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19939111) 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, 145473 + ... + 145609.

It is an arithmetic number, because the mean of its divisors is an integer number (1393524).

Almost surely, 2^19939117 is an apocalyptic number.

It is an amenable number.

19939117 is a deficient number, since it is larger than the sum of its proper divisors (2357267).

19939117 is a wasteful number, since it uses less digits than its factorization.

19939117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380.

The product of its digits is 15309, while the sum is 40.

The square root of 19939117 is about 4465.3238404398. The cubic root of 19939117 is about 271.1660452163.

The spelling of 19939117 in words is "nineteen million, nine hundred thirty-nine thousand, one hundred seventeen".