18057817 has 2 divisors, whose sum is σ = 18057818. Its totient is φ = 18057816.

The previous prime is 18057799. The next prime is 18057839. The reversal of 18057817 is 71875081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13111641 + 4946176 = 3621^2 + 2224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18057817 is a prime.

It is not a weakly prime, because it can be changed into another prime (18052817) 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 as a sum of consecutive naturals, namely, 9028908 + 9028909.

It is an arithmetic number, because the mean of its divisors is an integer number (9028909).

Almost surely, 2^18057817 is an apocalyptic number.

It is an amenable number.

18057817 is a deficient number, since it is larger than the sum of its proper divisors (1).

18057817 is an equidigital number, since it uses as much as digits as its factorization.

18057817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 37.

The square root of 18057817 is about 4249.4490231088. The cubic root of 18057817 is about 262.3544384213.

The spelling of 18057817 in words is "eighteen million, fifty-seven thousand, eight hundred seventeen".