19729493 has 4 divisors (see below), whose sum is σ = 22548000. Its totient is φ = 16910988.

The previous prime is 19729481. The next prime is 19729499. The reversal of 19729493 is 39492791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19729493 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 (19729499) 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 3 ways as a sum of consecutive naturals, for example, 1409243 + ... + 1409256.

It is an arithmetic number, because the mean of its divisors is an integer number (5637000).

Almost surely, 2^19729493 is an apocalyptic number.

It is an amenable number.

19729493 is a deficient number, since it is larger than the sum of its proper divisors (2818507).

19729493 is an equidigital number, since it uses as much as digits as its factorization.

19729493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818506.

The product of its digits is 122472, while the sum is 44.

The square root of 19729493 is about 4441.7893916754. The cubic root of 19729493 is about 270.2124208555.

The spelling of 19729493 in words is "nineteen million, seven hundred twenty-nine thousand, four hundred ninety-three".