8242840 has 32 divisors (see below), whose sum is σ = 18642960. Its totient is φ = 3280000.

The previous prime is 8242811. The next prime is 8242847. The reversal of 8242840 is 482428.

It is a super-2 number, since 2×8242840² = 135888822531200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8242799 and 8242808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8242847) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9630 + ... + 10450.

Almost surely, 2^8242840 is an apocalyptic number.

It is an amenable number.

8242840 is an abundant number, since it is smaller than the sum of its proper divisors (10400120).

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

8242840 is a wasteful number, since it uses less digits than its factorization.

8242840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 8242840 is about 2871.0346567048. The cubic root of 8242840 is about 202.0035290041.

The spelling of 8242840 in words is "eight million, two hundred forty-two thousand, eight hundred forty".