7909818 has 32 divisors (see below), whose sum is σ = 18468864. Its totient is φ = 2211312.

The previous prime is 7909801. The next prime is 7909829. The reversal of 7909818 is 8189097.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 7909818.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 30 + ... + 3977.

It is an arithmetic number, because the mean of its divisors is an integer number (577152).

Almost surely, 2^7909818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7909818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9234432).

7909818 is an abundant number, since it is smaller than the sum of its proper divisors (10559046).

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

7909818 is a wasteful number, since it uses less digits than its factorization.

7909818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4066.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 7909818 is about 2812.4398660238. The cubic root of 7909818 is about 199.2456416278.

The spelling of 7909818 in words is "seven million, nine hundred nine thousand, eight hundred eighteen".