19197842 has 4 divisors (see below), whose sum is σ = 28796766. Its totient is φ = 9598920.

The previous prime is 19197839. The next prime is 19197853. The reversal of 19197842 is 24879191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24879191 = 701 ⋅35491.

It can be written as a sum of positive squares in only one way, i.e., 19175641 + 22201 = 4379^2 + 149^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19197842.

It is an unprimeable number.

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, 4799459 + ... + 4799462.

Almost surely, 2^19197842 is an apocalyptic number.

19197842 is a deficient number, since it is larger than the sum of its proper divisors (9598924).

19197842 is an equidigital number, since it uses as much as digits as its factorization.

19197842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9598923.

The product of its digits is 36288, while the sum is 41.

The square root of 19197842 is about 4381.5342061885. The cubic root of 19197842 is about 267.7631474604.

The spelling of 19197842 in words is "nineteen million, one hundred ninety-seven thousand, eight hundred forty-two".