7991413 has 4 divisors (see below), whose sum is σ = 8026540. Its totient is φ = 7956288.

The previous prime is 7991407. The next prime is 7991437. The reversal of 7991413 is 3141997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3141997 = 47 ⋅66851.

It can be written as a sum of positive squares in 2 ways, for example, as 3694084 + 4297329 = 1922^2 + 2073^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7991413 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 (7991453) 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, 17220 + ... + 17677.

It is an arithmetic number, because the mean of its divisors is an integer number (2006635).

Almost surely, 2^7991413 is an apocalyptic number.

It is an amenable number.

7991413 is a deficient number, since it is larger than the sum of its proper divisors (35127).

7991413 is a wasteful number, since it uses less digits than its factorization.

7991413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35126.

The product of its digits is 6804, while the sum is 34.

The square root of 7991413 is about 2826.9087357041. The cubic root of 7991413 is about 199.9284160484.

The spelling of 7991413 in words is "seven million, nine hundred ninety-one thousand, four hundred thirteen".