842321247 has 8 divisors (see below), whose sum is σ = 1123255680. Its totient is φ = 561467160.

The previous prime is 842321239. The next prime is 842321309. The reversal of 842321247 is 742123248.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 842321247 - 2³ = 842321239 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842321237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11454 + ... + 42612.

It is an arithmetic number, because the mean of its divisors is an integer number (140406960).

Almost surely, 2^842321247 is an apocalyptic number.

842321247 is a deficient number, since it is larger than the sum of its proper divisors (280934433).

842321247 is a wasteful number, since it uses less digits than its factorization.

842321247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40173.

The product of its digits is 21504, while the sum is 33.

The square root of 842321247 is about 29022.7711805747. The cubic root of 842321247 is about 944.4071183828.

The spelling of 842321247 in words is "eight hundred forty-two million, three hundred twenty-one thousand, two hundred forty-seven".