842188947 has 4 divisors (see below), whose sum is σ = 1122918600. Its totient is φ = 561459296.

The previous prime is 842188937. The next prime is 842188969. The reversal of 842188947 is 749881248.

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

It is a cyclic number.

It is not a de Polignac number, because 842188947 - 2⁸ = 842188691 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 842188947.

It is not an unprimeable number, because it can be changed into a prime (842188937) 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 in 3 ways as a sum of consecutive naturals, for example, 140364822 + ... + 140364827.

It is an arithmetic number, because the mean of its divisors is an integer number (280729650).

Almost surely, 2^842188947 is an apocalyptic number.

842188947 is a deficient number, since it is larger than the sum of its proper divisors (280729653).

842188947 is a wasteful number, since it uses less digits than its factorization.

842188947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280729652.

The product of its digits is 1032192, while the sum is 51.

The square root of 842188947 is about 29020.4918462799. The cubic root of 842188947 is about 944.3576710553.

The spelling of 842188947 in words is "eight hundred forty-two million, one hundred eighty-eight thousand, nine hundred forty-seven".