18160909 has 12 divisors (see below), whose sum is σ = 20152692. Its totient is φ = 16348800.

The previous prime is 18160907. The next prime is 18160949. The reversal of 18160909 is 90906181.

It can be written as a sum of positive squares in 6 ways, for example, as 4120900 + 14040009 = 2030^2 + 3747^2 .

It is not a de Polignac number, because 18160909 - 2¹ = 18160907 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 (18160907) 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 11 ways as a sum of consecutive naturals, for example, 5619 + ... + 8239.

It is an arithmetic number, because the mean of its divisors is an integer number (1679391).

Almost surely, 2^18160909 is an apocalyptic number.

It is an amenable number.

18160909 is a deficient number, since it is larger than the sum of its proper divisors (1991783).

18160909 is a wasteful number, since it uses less digits than its factorization.

18160909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688 (or 2675 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 18160909 is about 4261.5618029075. The cubic root of 18160909 is about 262.8527514541.

The spelling of 18160909 in words is "eighteen million, one hundred sixty thousand, nine hundred nine".