7940665 has 4 divisors (see below), whose sum is σ = 9528804. Its totient is φ = 6352528.

The previous prime is 7940663. The next prime is 7940707. The reversal of 7940665 is 5660497.

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 5345344 + 2595321 = 2312^2 + 1611^2 .

It is a cyclic number.

It is not a de Polignac number, because 7940665 - 2¹ = 7940663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7940663) 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, 794062 + ... + 794071.

It is an arithmetic number, because the mean of its divisors is an integer number (2382201).

Almost surely, 2^7940665 is an apocalyptic number.

It is an amenable number.

7940665 is a deficient number, since it is larger than the sum of its proper divisors (1588139).

7940665 is a wasteful number, since it uses less digits than its factorization.

7940665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588138.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 7940665 is about 2817.9185580850. The cubic root of 7940665 is about 199.5043141593.

The spelling of 7940665 in words is "seven million, nine hundred forty thousand, six hundred sixty-five".