19928429 has 4 divisors (see below), whose sum is σ = 20114784. Its totient is φ = 19742076.

The previous prime is 19928401. The next prime is 19928453. The reversal of 19928429 is 92482991.

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 not a de Polignac number, because 19928429 - 2¹⁶ = 19862893 is a prime.

It is a super-3 number, since 3×19928429³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19928429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19927429) 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, 93017 + ... + 93230.

It is an arithmetic number, because the mean of its divisors is an integer number (5028696).

Almost surely, 2^19928429 is an apocalyptic number.

It is an amenable number.

19928429 is a deficient number, since it is larger than the sum of its proper divisors (186355).

19928429 is a wasteful number, since it uses less digits than its factorization.

19928429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186354.

The product of its digits is 93312, while the sum is 44.

The square root of 19928429 is about 4464.1269023181. The cubic root of 19928429 is about 271.1175853523.

The spelling of 19928429 in words is "nineteen million, nine hundred twenty-eight thousand, four hundred twenty-nine".