8709842 has 4 divisors (see below), whose sum is σ = 13064766. Its totient is φ = 4354920.

The previous prime is 8709839. The next prime is 8709871. The reversal of 8709842 is 2489078.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8288641 + 421201 = 2879^2 + 649^2 .

It is a super-2 number, since 2×8709842² = 151722695329928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8709796 and 8709805.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2177459 + ... + 2177462.

Almost surely, 2^8709842 is an apocalyptic number.

8709842 is a deficient number, since it is larger than the sum of its proper divisors (4354924).

8709842 is a wasteful number, since it uses less digits than its factorization.

8709842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4354923.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 8709842 is about 2951.2441444245. The cubic root of 8709842 is about 205.7485384891.

The spelling of 8709842 in words is "eight million, seven hundred nine thousand, eight hundred forty-two".