19706939 has 16 divisors (see below), whose sum is σ = 23079168. Its totient is φ = 16480032.

The previous prime is 19706909. The next prime is 19706941. The reversal of 19706939 is 93960791.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19706939 - 2²⁰ = 18658363 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19706939.

It is not an unprimeable number, because it can be changed into a prime (19706909) 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, 62009 + ... + 62325.

It is an arithmetic number, because the mean of its divisors is an integer number (1442448).

Almost surely, 2^19706939 is an apocalyptic number.

19706939 is a deficient number, since it is larger than the sum of its proper divisors (3372229).

19706939 is a wasteful number, since it uses less digits than its factorization.

19706939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514.

The product of its (nonzero) digits is 91854, while the sum is 44.

The square root of 19706939 is about 4439.2498240131. The cubic root of 19706939 is about 270.1094161018.

The spelling of 19706939 in words is "nineteen million, seven hundred six thousand, nine hundred thirty-nine".