19641442 has 4 divisors (see below), whose sum is σ = 29462166. Its totient is φ = 9820720.

The previous prime is 19641373. The next prime is 19641449. The reversal of 19641442 is 24414691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14447601 + 5193841 = 3801^2 + 2279^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (19641449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4910359 + ... + 4910362.

Almost surely, 2^19641442 is an apocalyptic number.

19641442 is a deficient number, since it is larger than the sum of its proper divisors (9820724).

19641442 is an equidigital number, since it uses as much as digits as its factorization.

19641442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9820723.

The product of its digits is 6912, while the sum is 31.

The square root of 19641442 is about 4431.8666496184. The cubic root of 19641442 is about 269.8098432447.

The spelling of 19641442 in words is "nineteen million, six hundred forty-one thousand, four hundred forty-two".