18057709 has 2 divisors, whose sum is σ = 18057710. Its totient is φ = 18057708.

The previous prime is 18057673. The next prime is 18057719. The reversal of 18057709 is 90775081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17598025 + 459684 = 4195^2 + 678^2 .

It is an emirp because it is prime and its reverse (90775081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18057709 - 2¹³ = 18049517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18057719) 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 as a sum of consecutive naturals, namely, 9028854 + 9028855.

It is an arithmetic number, because the mean of its divisors is an integer number (9028855).

Almost surely, 2^18057709 is an apocalyptic number.

It is an amenable number.

18057709 is a deficient number, since it is larger than the sum of its proper divisors (1).

18057709 is an equidigital number, since it uses as much as digits as its factorization.

18057709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 18057709 is about 4249.4363155600. The cubic root of 18057709 is about 262.3539153914.

The spelling of 18057709 in words is "eighteen million, fifty-seven thousand, seven hundred nine".