7978442 has 8 divisors (see below), whose sum is σ = 12597600. Its totient is φ = 3779244.

The previous prime is 7978441. The next prime is 7978459. The reversal of 7978442 is 2448797.

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

It is a self number, because there is not a number n which added to its sum of digits gives 7978442.

It is not an unprimeable number, because it can be changed into a prime (7978441) 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, 104942 + ... + 105017.

It is an arithmetic number, because the mean of its divisors is an integer number (1574700).

Almost surely, 2^7978442 is an apocalyptic number.

7978442 is a deficient number, since it is larger than the sum of its proper divisors (4619158).

7978442 is a wasteful number, since it uses less digits than its factorization.

7978442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209980.

The product of its digits is 112896, while the sum is 41.

The square root of 7978442 is about 2824.6136018932. The cubic root of 7978442 is about 199.8201883874.

The spelling of 7978442 in words is "seven million, nine hundred seventy-eight thousand, four hundred forty-two".