7999997 has 4 divisors (see below), whose sum is σ = 8109660. Its totient is φ = 7890336.

The previous prime is 7999993. The next prime is 8000009.

7999997 is nontrivially palindromic in base 10.

7999997 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1819801 + 6180196 = 1349^2 + 2486^2 .

It is a cyclic number.

It is not a de Polignac number, because 7999997 - 2² = 7999993 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 (7999993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54722 + ... + 54867.

It is an arithmetic number, because the mean of its divisors is an integer number (2027415).

Almost surely, 2^7999997 is an apocalyptic number.

It is an amenable number.

7999997 is a deficient number, since it is larger than the sum of its proper divisors (109663).

7999997 is a wasteful number, since it uses less digits than its factorization.

7999997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109662.

The product of its digits is 2893401, while the sum is 59.

The square root of 7999997 is about 2828.4265944161. The cubic root of 7999997 is about 199.9999750000. Note that the first 4 decimals are identical.

The spelling of 7999997 in words is "seven million, nine hundred ninety-nine thousand, nine hundred ninety-seven".