7978818 has 16 divisors (see below), whose sum is σ = 16030080. Its totient is φ = 2647536.

The previous prime is 7978807. The next prime is 7978819. The reversal of 7978818 is 8188797.

It is not an unprimeable number, because it can be changed into a prime (7978819) 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, 1530 + ... + 4277.

It is an arithmetic number, because the mean of its divisors is an integer number (1001880).

Almost surely, 2^7978818 is an apocalyptic number.

7978818 is an abundant number, since it is smaller than the sum of its proper divisors (8051262).

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

7978818 is a wasteful number, since it uses less digits than its factorization.

7978818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6041.

The product of its digits is 225792, while the sum is 48.

The square root of 7978818 is about 2824.6801588852. The cubic root of 7978818 is about 199.8233273131.

The spelling of 7978818 in words is "seven million, nine hundred seventy-eight thousand, eight hundred eighteen".