7818444 has 60 divisors (see below), whose sum is σ = 20836200. Its totient is φ = 2555712.

The previous prime is 7818397. The next prime is 7818451. The reversal of 7818444 is 4448187.

It is a happy number.

It is a super-2 number, since 2×7818444² = 122256133162272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 7818399 and 7818408.

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 19 ways as a sum of consecutive naturals, for example, 18912 + ... + 19320.

It is an arithmetic number, because the mean of its divisors is an integer number (347270).

Almost surely, 2^7818444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7818444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10418100).

7818444 is an abundant number, since it is smaller than the sum of its proper divisors (13017756).

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

7818444 is a wasteful number, since it uses less digits than its factorization.

7818444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484 (or 473 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 7818444 is about 2796.1480647491. The cubic root of 7818444 is about 198.4754414689.

The spelling of 7818444 in words is "seven million, eight hundred eighteen thousand, four hundred forty-four".