843540642 has 80 divisors (see below), whose sum is σ = 2212987392. Its totient is φ = 235120320.

The previous prime is 843540637. The next prime is 843540667. The reversal of 843540642 is 246045348.

843540642 is a `hidden beast` number, since 8 + 4 + 3 + 5 + 4 + 0 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 843540597 and 843540606.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 37423 + ... + 55565.

Almost surely, 2^843540642 is an apocalyptic number.

843540642 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 843540642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1106493696).

843540642 is an abundant number, since it is smaller than the sum of its proper divisors (1369446750).

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

843540642 is a wasteful number, since it uses less digits than its factorization.

843540642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18205 (or 18196 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The square root of 843540642 is about 29043.7711394371. The cubic root of 843540642 is about 944.8626255335.

The spelling of 843540642 in words is "eight hundred forty-three million, five hundred forty thousand, six hundred forty-two".