7978408 has 32 divisors (see below), whose sum is σ = 15759360. Its totient is φ = 3781440.

The previous prime is 7978403. The next prime is 7978409. The reversal of 7978408 is 8048797.

It is not an unprimeable number, because it can be changed into a prime (7978403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12841 + ... + 13447.

It is an arithmetic number, because the mean of its divisors is an integer number (492480).

Almost surely, 2^7978408 is an apocalyptic number.

It is an amenable number.

7978408 is a deficient number, since it is larger than the sum of its proper divisors (7780952).

7978408 is a wasteful number, since it uses less digits than its factorization.

7978408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 7978408 is about 2824.6075833645. The cubic root of 7978408 is about 199.8199045435.

It can be divided in two parts, 79 and 78408, that added together give a palindrome (78487).

The spelling of 7978408 in words is "seven million, nine hundred seventy-eight thousand, four hundred eight".