7991345 has 8 divisors (see below), whose sum is σ = 9689064. Its totient is φ = 6326784.

The previous prime is 7991341. The next prime is 7991369. The reversal of 7991345 is 5431997.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 351649 + 7639696 = 593^2 + 2764^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7991345 - 2² = 7991341 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7991299 and 7991308.

It is not an unprimeable number, because it can be changed into a prime (7991341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7754 + ... + 8723.

It is an arithmetic number, because the mean of its divisors is an integer number (1211133).

Almost surely, 2^7991345 is an apocalyptic number.

It is an amenable number.

7991345 is a deficient number, since it is larger than the sum of its proper divisors (1697719).

7991345 is a wasteful number, since it uses less digits than its factorization.

7991345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16579.

The product of its digits is 34020, while the sum is 38.

The square root of 7991345 is about 2826.8967084066. The cubic root of 7991345 is about 199.9278489743.

The spelling of 7991345 in words is "seven million, nine hundred ninety-one thousand, three hundred forty-five".