7939845 has 24 divisors (see below), whose sum is σ = 13956696. Its totient is φ = 4174848.

The previous prime is 7939837. The next prime is 7939847. The reversal of 7939845 is 5489397.

It can be written as a sum of positive squares in 4 ways, for example, as 3038049 + 4901796 = 1743^2 + 2214^2 .

It is not a de Polignac number, because 7939845 - 2³ = 7939837 is a prime.

It is a super-2 number, since 2×7939845² = 126082277248050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 7939845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7939847) 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 23 ways as a sum of consecutive naturals, for example, 2077 + ... + 4493.

It is an arithmetic number, because the mean of its divisors is an integer number (581529).

Almost surely, 2^7939845 is an apocalyptic number.

It is an amenable number.

7939845 is a deficient number, since it is larger than the sum of its proper divisors (6016851).

7939845 is a wasteful number, since it uses less digits than its factorization.

7939845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2501 (or 2498 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 7939845 is about 2817.7730568660. The cubic root of 7939845 is about 199.4974465914.

The spelling of 7939845 in words is "seven million, nine hundred thirty-nine thousand, eight hundred forty-five".