8637997 has 4 divisors (see below), whose sum is σ = 8644636. Its totient is φ = 8631360.

The previous prime is 8637991. The next prime is 8638033. The reversal of 8637997 is 7997368.

8637997 is digitally balanced in base 2, 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6405961 + 2232036 = 2531^2 + 1494^2 .

It is a cyclic number.

It is not a de Polignac number, because 8637997 - 2⁷ = 8637869 is a prime.

It is a super-2 number, since 2×8637997² = 149229984344018, which contains 22 as substring.

It is a d-powerful number, because it can be written as 8⁷ + 6⁸ + 3 + 7⁴ + 9⁵ + 9⁷ + 7⁵ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8637997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8637991) 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, 654 + ... + 4207.

It is an arithmetic number, because the mean of its divisors is an integer number (2161159).

Almost surely, 2^8637997 is an apocalyptic number.

It is an amenable number.

8637997 is a deficient number, since it is larger than the sum of its proper divisors (6639).

8637997 is a wasteful number, since it uses less digits than its factorization.

8637997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6638.

The product of its digits is 571536, while the sum is 49.

The square root of 8637997 is about 2939.0469543714. The cubic root of 8637997 is about 205.1812555154.

It can be divided in two parts, 86 and 37997, that added together give a palindrome (38083).

The spelling of 8637997 in words is "eight million, six hundred thirty-seven thousand, nine hundred ninety-seven".