7991479 has 4 divisors (see below), whose sum is σ = 8461584. Its totient is φ = 7521376.

The previous prime is 7991471. The next prime is 7991483. The reversal of 7991479 is 9741997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9741997 = 659 ⋅14783.

It is a cyclic number.

It is not a de Polignac number, because 7991479 - 2³ = 7991471 is a prime.

It is a Duffinian number.

7991479 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991471) 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, 235027 + ... + 235060.

It is an arithmetic number, because the mean of its divisors is an integer number (2115396).

Almost surely, 2^7991479 is an apocalyptic number.

7991479 is a deficient number, since it is larger than the sum of its proper divisors (470105).

7991479 is a wasteful number, since it uses less digits than its factorization.

7991479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470104.

The product of its digits is 142884, while the sum is 46.

The square root of 7991479 is about 2826.9204092086. The cubic root of 7991479 is about 199.9289664408.

It can be divided in two parts, 799 and 1479, that added together give a triangular number (2278 = T₆₇).

The spelling of 7991479 in words is "seven million, nine hundred ninety-one thousand, four hundred seventy-nine".