19686429 has 16 divisors (see below), whose sum is σ = 33331840. Its totient is φ = 11249280.

The previous prime is 19686427. The next prime is 19686463. The reversal of 19686429 is 92468691.

It is a happy number.

It is not a de Polignac number, because 19686429 - 2¹ = 19686427 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19686427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51892 + ... + 52269.

It is an arithmetic number, because the mean of its divisors is an integer number (2083240).

Almost surely, 2^19686429 is an apocalyptic number.

It is an amenable number.

19686429 is a deficient number, since it is larger than the sum of its proper divisors (13645411).

19686429 is a wasteful number, since it uses less digits than its factorization.

19686429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104177 (or 104171 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 19686429 is about 4436.9391476557. The cubic root of 19686429 is about 270.0156781019.

The spelling of 19686429 in words is "nineteen million, six hundred eighty-six thousand, four hundred twenty-nine".