7921799 has 4 divisors (see below), whose sum is σ = 7935336. Its totient is φ = 7908264.

The previous prime is 7921787. The next prime is 7921817. The reversal of 7921799 is 9971297.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9971297 = 7 ⋅1424471.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7921799 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 (7921759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5849 + ... + 7074.

It is an arithmetic number, because the mean of its divisors is an integer number (1983834).

Almost surely, 2^7921799 is an apocalyptic number.

7921799 is a deficient number, since it is larger than the sum of its proper divisors (13537).

7921799 is a wasteful number, since it uses less digits than its factorization.

7921799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13536.

The product of its digits is 71442, while the sum is 44.

The square root of 7921799 is about 2814.5690611531. The cubic root of 7921799 is about 199.3461899914.

The spelling of 7921799 in words is "seven million, nine hundred twenty-one thousand, seven hundred ninety-nine".