19443442 has 4 divisors (see below), whose sum is σ = 29165166. Its totient is φ = 9721720.

The previous prime is 19443433. The next prime is 19443443. The reversal of 19443442 is 24434491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24434491 = 17 ⋅1437323.

It can be written as a sum of positive squares in only one way, i.e., 10569001 + 8874441 = 3251^2 + 2979^2 .

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 (19443443) by changing a digit.

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 as a sum of consecutive naturals, namely, 4860859 + ... + 4860862.

Almost surely, 2^19443442 is an apocalyptic number.

19443442 is a deficient number, since it is larger than the sum of its proper divisors (9721724).

19443442 is an equidigital number, since it uses as much as digits as its factorization.

19443442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9721723.

The product of its digits is 13824, while the sum is 31.

The square root of 19443442 is about 4409.4718504601. The cubic root of 19443442 is about 268.9001531935.

The spelling of 19443442 in words is "nineteen million, four hundred forty-three thousand, four hundred forty-two".