7998313 has 4 divisors (see below), whose sum is σ = 8468820. Its totient is φ = 7527808.

The previous prime is 7998307. The next prime is 7998337. The reversal of 7998313 is 3138997.

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 6290064 + 1708249 = 2508^2 + 1307^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7998313 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

7998313 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7998383) 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, 235228 + ... + 235261.

It is an arithmetic number, because the mean of its divisors is an integer number (2117205).

Almost surely, 2^7998313 is an apocalyptic number.

It is an amenable number.

7998313 is a deficient number, since it is larger than the sum of its proper divisors (470507).

7998313 is a wasteful number, since it uses less digits than its factorization.

7998313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470506.

The product of its digits is 40824, while the sum is 40.

The square root of 7998313 is about 2828.1288867377. The cubic root of 7998313 is about 199.9859406784.

It can be divided in two parts, 7 and 998313, that multiplied together give a triangular number (6988191 = T₃₇₃₈).

The spelling of 7998313 in words is "seven million, nine hundred ninety-eight thousand, three hundred thirteen".