7939985 has 4 divisors (see below), whose sum is σ = 9527988. Its totient is φ = 6351984.

The previous prime is 7939979. The next prime is 7940011. The reversal of 7939985 is 5899397.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5899397 = 7 ⋅842771.

It can be written as a sum of positive squares in 2 ways, for example, as 6071296 + 1868689 = 2464^2 + 1367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7939985 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 793994 + ... + 794003.

It is an arithmetic number, because the mean of its divisors is an integer number (2381997).

Almost surely, 2^7939985 is an apocalyptic number.

It is an amenable number.

7939985 is a deficient number, since it is larger than the sum of its proper divisors (1588003).

7939985 is a wasteful number, since it uses less digits than its factorization.

7939985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588002.

The product of its digits is 612360, while the sum is 50.

The square root of 7939985 is about 2817.7978990694. The cubic root of 7939985 is about 199.4986191365.

The spelling of 7939985 in words is "seven million, nine hundred thirty-nine thousand, nine hundred eighty-five".