19729894 has 8 divisors (see below), whose sum is σ = 31335768. Its totient is φ = 9284640.

The previous prime is 19729873. The next prime is 19729903. The reversal of 19729894 is 49892791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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, 290112 + ... + 290179.

It is an arithmetic number, because the mean of its divisors is an integer number (3916971).

Almost surely, 2^19729894 is an apocalyptic number.

19729894 is a deficient number, since it is larger than the sum of its proper divisors (11605874).

19729894 is a wasteful number, since it uses less digits than its factorization.

19729894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580310.

The product of its digits is 326592, while the sum is 49.

The square root of 19729894 is about 4441.8345309117. The cubic root of 19729894 is about 270.2142515233.

The spelling of 19729894 in words is "nineteen million, seven hundred twenty-nine thousand, eight hundred ninety-four".