817084842 has 16 divisors (see below), whose sum is σ = 1867622592. Its totient is φ = 233452800.

The previous prime is 817084837. The next prime is 817084843. The reversal of 817084842 is 248480718.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 19454401 = 817084842 / (8 + 1 + 7 + 0 + 8 + 4 + 8 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 817084794 and 817084803.

It is not an unprimeable number, because it can be changed into a prime (817084843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9727159 + ... + 9727242.

It is an arithmetic number, because the mean of its divisors is an integer number (116726412).

Almost surely, 2^817084842 is an apocalyptic number.

817084842 is an abundant number, since it is smaller than the sum of its proper divisors (1050537750).

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

817084842 is a wasteful number, since it uses less digits than its factorization.

817084842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19454413.

The product of its (nonzero) digits is 114688, while the sum is 42.

The square root of 817084842 is about 28584.6959403104. The cubic root of 817084842 is about 934.8796749085.

The spelling of 817084842 in words is "eight hundred seventeen million, eighty-four thousand, eight hundred forty-two".