19238642 has 4 divisors (see below), whose sum is σ = 28857966. Its totient is φ = 9619320.

The previous prime is 19238641. The next prime is 19238647. The reversal of 19238642 is 24683291.

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., 19175641 + 63001 = 4379^2 + 251^2 .

It is not an unprimeable number, because it can be changed into a prime (19238641) 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, 4809659 + ... + 4809662.

Almost surely, 2^19238642 is an apocalyptic number.

19238642 is a deficient number, since it is larger than the sum of its proper divisors (9619324).

19238642 is an equidigital number, since it uses as much as digits as its factorization.

19238642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9619323.

The product of its digits is 20736, while the sum is 35.

The square root of 19238642 is about 4386.1876384852. The cubic root of 19238642 is about 267.9527001250.

The spelling of 19238642 in words is "nineteen million, two hundred thirty-eight thousand, six hundred forty-two".