7998481 has 2 divisors, whose sum is σ = 7998482. Its totient is φ = 7998480.

The previous prime is 7998451. The next prime is 7998491. The reversal of 7998481 is 1848997.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5564881 + 2433600 = 2359^2 + 1560^2 .

It is an emirp because it is prime and its reverse (1848997) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7998481 is a prime.

It is a super-2 number, since 2×7998481² = 127951396614722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7998421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3999240 + 3999241.

It is an arithmetic number, because the mean of its divisors is an integer number (3999241).

Almost surely, 2^7998481 is an apocalyptic number.

It is an amenable number.

7998481 is a deficient number, since it is larger than the sum of its proper divisors (1).

7998481 is an equidigital number, since it uses as much as digits as its factorization.

7998481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 46.

The square root of 7998481 is about 2828.1585881983. The cubic root of 7998481 is about 199.9873408654.

The spelling of 7998481 in words is "seven million, nine hundred ninety-eight thousand, four hundred eighty-one".