17940109 has 4 divisors (see below), whose sum is σ = 19571040. Its totient is φ = 16309180.

The previous prime is 17940107. The next prime is 17940113. The reversal of 17940109 is 90104971.

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.

It is a cyclic number.

It is not a de Polignac number, because 17940109 - 2¹ = 17940107 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17940107) 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 3 ways as a sum of consecutive naturals, for example, 815449 + ... + 815470.

It is an arithmetic number, because the mean of its divisors is an integer number (4892760).

Almost surely, 2^17940109 is an apocalyptic number.

It is an amenable number.

17940109 is a deficient number, since it is larger than the sum of its proper divisors (1630931).

17940109 is a wasteful number, since it uses less digits than its factorization.

17940109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630930.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 17940109 is about 4235.5765841264. The cubic root of 17940109 is about 261.7831519631.

The spelling of 17940109 in words is "seventeen million, nine hundred forty thousand, one hundred nine".