7998426 has 40 divisors (see below), whose sum is σ = 18142740. Its totient is φ = 2633472.

The previous prime is 7998421. The next prime is 7998437. The reversal of 7998426 is 6248997.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7834401 + 164025 = 2799^2 + 405^2 .

It is not an unprimeable number, because it can be changed into a prime (7998421) 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 19 ways as a sum of consecutive naturals, for example, 15460 + ... + 15968.

Almost surely, 2^7998426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7998426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9071370).

7998426 is an abundant number, since it is smaller than the sum of its proper divisors (10144314).

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

7998426 is a wasteful number, since it uses less digits than its factorization.

7998426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 611 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 7998426 is about 2828.1488645402. The cubic root of 7998426 is about 199.9868824730.

The spelling of 7998426 in words is "seven million, nine hundred ninety-eight thousand, four hundred twenty-six".