7998997 has 4 divisors (see below), whose sum is σ = 8004960. Its totient is φ = 7993036.

The previous prime is 7998979. The next prime is 7999051.

7998997 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7998997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7998937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78 + ... + 4000.

It is an arithmetic number, because the mean of its divisors is an integer number (2001240).

Almost surely, 2^7998997 is an apocalyptic number.

It is an amenable number.

7998997 is a deficient number, since it is larger than the sum of its proper divisors (5963).

7998997 is a wasteful number, since it uses less digits than its factorization.

7998997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5962.

The product of its digits is 2571912, while the sum is 58.

The square root of 7998997 is about 2828.2498121630. The cubic root of 7998997 is about 199.9916413173.

The spelling of 7998997 in words is "seven million, nine hundred ninety-eight thousand, nine hundred ninety-seven".