7999973 has 4 divisors (see below), whose sum is σ = 8040780. Its totient is φ = 7959168.

The previous prime is 7999963. The next prime is 7999993. The reversal of 7999973 is 3799997.

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 5303809 + 2696164 = 2303^2 + 1642^2 .

It is a cyclic number.

It is not a de Polignac number, because 7999973 - 2⁶ = 7999909 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 (7999913) 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, 20108 + ... + 20501.

It is an arithmetic number, because the mean of its divisors is an integer number (2010195).

Almost surely, 2^7999973 is an apocalyptic number.

It is an amenable number.

7999973 is a deficient number, since it is larger than the sum of its proper divisors (40807).

7999973 is a wasteful number, since it uses less digits than its factorization.

7999973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40806.

The product of its digits is 964467, while the sum is 53.

The square root of 7999973 is about 2828.4223517714. The cubic root of 7999973 is about 199.9997749997. Note that the first 3 decimals are identical.

The spelling of 7999973 in words is "seven million, nine hundred ninety-nine thousand, nine hundred seventy-three".