7864609 has 4 divisors (see below), whose sum is σ = 8077204. Its totient is φ = 7652016.

The previous prime is 7864589. The next prime is 7864621. The reversal of 7864609 is 9064687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9064687 = 353 ⋅25679.

It can be written as a sum of positive squares in 2 ways, for example, as 7617600 + 247009 = 2760^2 + 497^2 .

It is a cyclic number.

It is not a de Polignac number, because 7864609 - 2¹³ = 7856417 is a prime.

It is a Duffinian number.

7864609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7864639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106242 + ... + 106315.

It is an arithmetic number, because the mean of its divisors is an integer number (2019301).

Almost surely, 2^7864609 is an apocalyptic number.

It is an amenable number.

7864609 is a deficient number, since it is larger than the sum of its proper divisors (212595).

7864609 is a wasteful number, since it uses less digits than its factorization.

7864609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212594.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 7864609 is about 2804.3910212379. The cubic root of 7864609 is about 198.8653163055.

The spelling of 7864609 in words is "seven million, eight hundred sixty-four thousand, six hundred nine".