842121678 has 32 divisors (see below), whose sum is σ = 1765861632. Its totient is φ = 267220800.

The previous prime is 842121677. The next prime is 842121689. The reversal of 842121678 is 876121248.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842121677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14658 + ... + 43578.

It is an arithmetic number, because the mean of its divisors is an integer number (55183176).

Almost surely, 2^842121678 is an apocalyptic number.

842121678 is an abundant number, since it is smaller than the sum of its proper divisors (923739954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

842121678 is a wasteful number, since it uses less digits than its factorization.

842121678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29160.

The product of its digits is 43008, while the sum is 39.

The square root of 842121678 is about 29019.3328317520. The cubic root of 842121678 is about 944.3325271776.

The spelling of 842121678 in words is "eight hundred forty-two million, one hundred twenty-one thousand, six hundred seventy-eight".