18373709 has 2 divisors, whose sum is σ = 18373710. Its totient is φ = 18373708.

The previous prime is 18373697. The next prime is 18373723. The reversal of 18373709 is 90737381.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13764100 + 4609609 = 3710^2 + 2147^2 .

It is a cyclic number.

It is not a de Polignac number, because 18373709 - 2¹² = 18369613 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18373739) 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, 9186854 + 9186855.

It is an arithmetic number, because the mean of its divisors is an integer number (9186855).

Almost surely, 2^18373709 is an apocalyptic number.

It is an amenable number.

18373709 is a deficient number, since it is larger than the sum of its proper divisors (1).

18373709 is an equidigital number, since it uses as much as digits as its factorization.

18373709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 18373709 is about 4286.4564619275. The cubic root of 18373709 is about 263.8754242749.

The spelling of 18373709 in words is "eighteen million, three hundred seventy-three thousand, seven hundred nine".