842638191 has 16 divisors (see below), whose sum is σ = 1177693440. Its totient is φ = 535308480.

The previous prime is 842638183. The next prime is 842638207. The reversal of 842638191 is 191836248.

It is not a de Polignac number, because 842638191 - 2³ = 842638183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842638591) 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 15 ways as a sum of consecutive naturals, for example, 74371 + ... + 84948.

It is an arithmetic number, because the mean of its divisors is an integer number (73605840).

Almost surely, 2^842638191 is an apocalyptic number.

842638191 is a deficient number, since it is larger than the sum of its proper divisors (335055249).

842638191 is a wasteful number, since it uses less digits than its factorization.

842638191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159406.

The product of its digits is 82944, while the sum is 42.

The square root of 842638191 is about 29028.2309312848. The cubic root of 842638191 is about 944.5255556323.

The spelling of 842638191 in words is "eight hundred forty-two million, six hundred thirty-eight thousand, one hundred ninety-one".