842339840 has 80 divisors (see below), whose sum is σ = 2028338928. Its totient is φ = 335486976.

The previous prime is 842339837. The next prime is 842339893. The reversal of 842339840 is 48933248.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749519 + ... + 750641.

Almost surely, 2^842339840 is an apocalyptic number.

842339840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 842339840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1014169464).

842339840 is an abundant number, since it is smaller than the sum of its proper divisors (1185999088).

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

842339840 is a wasteful number, since it uses less digits than its factorization.

842339840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439 (or 1423 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 842339840 is about 29023.0914962552. The cubic root of 842339840 is about 944.4140671301.

The spelling of 842339840 in words is "eight hundred forty-two million, three hundred thirty-nine thousand, eight hundred forty".