7939818 has 12 divisors (see below), whose sum is σ = 17202978. Its totient is φ = 2646600.

The previous prime is 7939817. The next prime is 7939829. The reversal of 7939818 is 8189397.

It can be written as a sum of positive squares in only one way, i.e., 6953769 + 986049 = 2637^2 + 993^2 .

It is not an unprimeable number, because it can be changed into a prime (7939817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220533 + ... + 220568.

Almost surely, 2^7939818 is an apocalyptic number.

7939818 is an abundant number, since it is smaller than the sum of its proper divisors (9263160).

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

7939818 is a wasteful number, since it uses less digits than its factorization.

7939818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441109 (or 441106 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 7939818 is about 2817.7682658444. The cubic root of 7939818 is about 199.4972204561.

The spelling of 7939818 in words is "seven million, nine hundred thirty-nine thousand, eight hundred eighteen".