18037609 has 2 divisors, whose sum is σ = 18037610. Its totient is φ = 18037608.

The previous prime is 18037603. The next prime is 18037619. The reversal of 18037609 is 90673081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17405584 + 632025 = 4172^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 18037609 - 2³ = 18037601 is a prime.

It is not a weakly prime, because it can be changed into another prime (18037601) 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, 9018804 + 9018805.

It is an arithmetic number, because the mean of its divisors is an integer number (9018805).

Almost surely, 2^18037609 is an apocalyptic number.

It is an amenable number.

18037609 is a deficient number, since it is larger than the sum of its proper divisors (1).

18037609 is an equidigital number, since it uses as much as digits as its factorization.

18037609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 18037609 is about 4247.0706375100. The cubic root of 18037609 is about 262.2565373780.

The spelling of 18037609 in words is "eighteen million, thirty-seven thousand, six hundred nine".