17680609 has 4 divisors (see below), whose sum is σ = 17693104. Its totient is φ = 17668116.

The previous prime is 17680603. The next prime is 17680613. The reversal of 17680609 is 90608671.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90608671 = 37 ⋅2448883.

It is a cyclic number.

It is not a de Polignac number, because 17680609 - 2⁹ = 17680097 is a prime.

It is a super-2 number, since 2×17680609² = 625207869221762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17680603) 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 3 ways as a sum of consecutive naturals, for example, 3807 + ... + 7060.

It is an arithmetic number, because the mean of its divisors is an integer number (4423276).

Almost surely, 2^17680609 is an apocalyptic number.

It is an amenable number.

17680609 is a deficient number, since it is larger than the sum of its proper divisors (12495).

17680609 is a wasteful number, since it uses less digits than its factorization.

17680609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12494.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 17680609 is about 4204.8316256421. The cubic root of 17680609 is about 260.5148034809.

It can be divided in two parts, 17680 and 609, that multiplied together give a triangular number (10767120 = T₄₆₄₀).

The spelling of 17680609 in words is "seventeen million, six hundred eighty thousand, six hundred nine".