8242642 has 4 divisors (see below), whose sum is σ = 12363966. Its totient is φ = 4121320.

The previous prime is 8242639. The next prime is 8242667. The reversal of 8242642 is 2462428.

It is a Cunningham number, because it is equal to 2871²+1.

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., 8242641 + 1 = 2871^2 + 1^2 .

It is a super-2 number, since 2×8242642² = 135882294280328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8242642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2060659 + ... + 2060662.

Almost surely, 2^8242642 is an apocalyptic number.

8242642 is a deficient number, since it is larger than the sum of its proper divisors (4121324).

8242642 is a wasteful number, since it uses less digits than its factorization.

8242642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4121323.

The product of its digits is 6144, while the sum is 28.

The square root of 8242642 is about 2871.0001741553. Note that the first 3 decimals coincide. The cubic root of 8242642 is about 202.0019115592.

It can be divided in two parts, 82 and 42642, that added together give a palindrome (42724).

The spelling of 8242642 in words is "eight million, two hundred forty-two thousand, six hundred forty-two".