19642229 has 4 divisors (see below), whose sum is σ = 19783680. Its totient is φ = 19500780.

The previous prime is 19642159. The next prime is 19642237. The reversal of 19642229 is 92224691.

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-19642229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19642729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70517 + ... + 70794.

It is an arithmetic number, because the mean of its divisors is an integer number (4945920).

Almost surely, 2^19642229 is an apocalyptic number.

It is an amenable number.

19642229 is a deficient number, since it is larger than the sum of its proper divisors (141451).

19642229 is a wasteful number, since it uses less digits than its factorization.

19642229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141450.

The product of its digits is 15552, while the sum is 35.

The square root of 19642229 is about 4431.9554375016. The cubic root of 19642229 is about 269.8134468075.

The spelling of 19642229 in words is "nineteen million, six hundred forty-two thousand, two hundred twenty-nine".