7878242 has 16 divisors (see below), whose sum is σ = 12610080. Its totient is φ = 3678528.

The previous prime is 7878239. The next prime is 7878251. The reversal of 7878242 is 2428787.

It is a junction number, because it is equal to n+sod(n) for n = 7878196 and 7878205.

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 in 7 ways as a sum of consecutive naturals, for example, 3893 + ... + 5559.

It is an arithmetic number, because the mean of its divisors is an integer number (788130).

Almost surely, 2^7878242 is an apocalyptic number.

7878242 is a deficient number, since it is larger than the sum of its proper divisors (4731838).

7878242 is a wasteful number, since it uses less digits than its factorization.

7878242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825.

The product of its digits is 50176, while the sum is 38.

The square root of 7878242 is about 2806.8206212724. The cubic root of 7878242 is about 198.9801584554.

The spelling of 7878242 in words is "seven million, eight hundred seventy-eight thousand, two hundred forty-two".