842081857 has 8 divisors (see below), whose sum is σ = 863400384. Its totient is φ = 820842288.

The previous prime is 842081839. The next prime is 842081869. The reversal of 842081857 is 758180248.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842081857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842081897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2163 + ... + 41095.

It is an arithmetic number, because the mean of its divisors is an integer number (107925048).

Almost surely, 2^842081857 is an apocalyptic number.

It is an amenable number.

842081857 is a deficient number, since it is larger than the sum of its proper divisors (21318527).

842081857 is a wasteful number, since it uses less digits than its factorization.

842081857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39479.

The product of its (nonzero) digits is 143360, while the sum is 43.

The square root of 842081857 is about 29018.6467120712. The cubic root of 842081857 is about 944.3176422113.

The spelling of 842081857 in words is "eight hundred forty-two million, eighty-one thousand, eight hundred fifty-seven".