7005609 has 20 divisors (see below), whose sum is σ = 11271876. Its totient is φ = 4310496.

The previous prime is 7005571. The next prime is 7005613. The reversal of 7005609 is 9065007.

It can be written as a sum of positive squares in 2 ways, for example, as 518400 + 6487209 = 720^2 + 2547^2 .

It is not a de Polignac number, because 7005609 - 2¹¹ = 7003561 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7005619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2274 + ... + 4379.

Almost surely, 2^7005609 is an apocalyptic number.

It is an amenable number.

7005609 is a deficient number, since it is larger than the sum of its proper divisors (4266267).

7005609 is a wasteful number, since it uses less digits than its factorization.

7005609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6678 (or 6669 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 7005609 is about 2646.8111001732. The cubic root of 7005609 is about 191.3441981175.

It can be divided in two parts, 700560 and 9, that added together give a square (700569 = 837²).

The spelling of 7005609 in words is "seven million, five thousand, six hundred nine".