19728429 has 12 divisors (see below), whose sum is σ = 30599424. Its totient is φ = 11273304.

The previous prime is 19728427. The next prime is 19728473. The reversal of 19728429 is 92482791.

It is not a de Polignac number, because 19728429 - 2¹ = 19728427 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19728427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66957 + ... + 67250.

It is an arithmetic number, because the mean of its divisors is an integer number (2549952).

Almost surely, 2^19728429 is an apocalyptic number.

It is an amenable number.

19728429 is a deficient number, since it is larger than the sum of its proper divisors (10870995).

19728429 is a wasteful number, since it uses less digits than its factorization.

19728429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134224 (or 134217 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 19728429 is about 4441.6696185106. The cubic root of 19728429 is about 270.2075633023.

It can be divided in two parts, 1972 and 8429, that added together give a palindrome (10401).

The spelling of 19728429 in words is "nineteen million, seven hundred twenty-eight thousand, four hundred twenty-nine".