18195709 has 6 divisors (see below), whose sum is σ = 21166494. Its totient is φ = 15596280.

The previous prime is 18195689. The next prime is 18195713. The reversal of 18195709 is 90759181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16426809 + 1768900 = 4053^2 + 1330^2 .

It is not a de Polignac number, because 18195709 - 2¹¹ = 18193661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18195719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 185622 + ... + 185719.

It is an arithmetic number, because the mean of its divisors is an integer number (3527749).

Almost surely, 2^18195709 is an apocalyptic number.

It is an amenable number.

18195709 is a deficient number, since it is larger than the sum of its proper divisors (2970785).

18195709 is an equidigital number, since it uses as much as digits as its factorization.

18195709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371355 (or 371348 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 18195709 is about 4265.6428589370. The cubic root of 18195709 is about 263.0205374624.

The spelling of 18195709 in words is "eighteen million, one hundred ninety-five thousand, seven hundred nine".