7978242 has 8 divisors (see below), whose sum is σ = 15956496. Its totient is φ = 2659412.

The previous prime is 7978237. The next prime is 7978247. The reversal of 7978242 is 2428797.

7978242 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (7978237) and next prime (7978247).

It is a sphenic number, since it is the product of 3 distinct primes.

7978242 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 7978242.

It is not an unprimeable number, because it can be changed into a prime (7978247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664848 + ... + 664859.

It is an arithmetic number, because the mean of its divisors is an integer number (1994562).

Almost surely, 2^7978242 is an apocalyptic number.

7978242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

7978242 is a wasteful number, since it uses less digits than its factorization.

7978242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329712.

The product of its digits is 56448, while the sum is 39.

The square root of 7978242 is about 2824.5781985989. The cubic root of 7978242 is about 199.8185187058.

The spelling of 7978242 in words is "seven million, nine hundred seventy-eight thousand, two hundred forty-two".