19729396 has 12 divisors (see below), whose sum is σ = 35717220. Its totient is φ = 9524480.

The previous prime is 19729393. The next prime is 19729397. The reversal of 19729396 is 69392791.

It can be written as a sum of positive squares in 2 ways, for example, as 4410000 + 15319396 = 2100^2 + 3914^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19729393) 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 3 ways as a sum of consecutive naturals, for example, 84925 + ... + 85156.

It is an arithmetic number, because the mean of its divisors is an integer number (2976435).

Almost surely, 2^19729396 is an apocalyptic number.

It is an amenable number.

19729396 is a deficient number, since it is larger than the sum of its proper divisors (15987824).

19729396 is a wasteful number, since it uses less digits than its factorization.

19729396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170114 (or 170112 counting only the distinct ones).

The product of its digits is 183708, while the sum is 46.

The square root of 19729396 is about 4441.7784726391. The cubic root of 19729396 is about 270.2119780219.

The spelling of 19729396 in words is "nineteen million, seven hundred twenty-nine thousand, three hundred ninety-six".