7918997 has 4 divisors (see below), whose sum is σ = 7925196. Its totient is φ = 7912800.

The previous prime is 7918987. The next prime is 7919003. The reversal of 7918997 is 7998197.

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 2283121 + 5635876 = 1511^2 + 2374^2 .

It is a cyclic number.

It is not a de Polignac number, because 7918997 - 2²⁰ = 6870421 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 (7918987) 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 3 ways as a sum of consecutive naturals, for example, 398 + ... + 3999.

It is an arithmetic number, because the mean of its divisors is an integer number (1981299).

Almost surely, 2^7918997 is an apocalyptic number.

It is an amenable number.

7918997 is a deficient number, since it is larger than the sum of its proper divisors (6199).

7918997 is a wasteful number, since it uses less digits than its factorization.

7918997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6198.

The product of its digits is 285768, while the sum is 50.

The square root of 7918997 is about 2814.0712499864. The cubic root of 7918997 is about 199.3226838032.

The spelling of 7918997 in words is "seven million, nine hundred eighteen thousand, nine hundred ninety-seven".