38218309 has 2 divisors, whose sum is σ = 38218310. Its totient is φ = 38218308.

The previous prime is 38218303. The next prime is 38218321. The reversal of 38218309 is 90381283.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38167684 + 50625 = 6178^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 38218309 - 2⁵ = 38218277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38218303) 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, 19109154 + 19109155.

It is an arithmetic number, because the mean of its divisors is an integer number (19109155).

Almost surely, 2^38218309 is an apocalyptic number.

It is an amenable number.

38218309 is a deficient number, since it is larger than the sum of its proper divisors (1).

38218309 is an equidigital number, since it uses as much as digits as its factorization.

38218309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 38218309 is about 6182.0958420264. The cubic root of 38218309 is about 336.8401270404.

The spelling of 38218309 in words is "thirty-eight million, two hundred eighteen thousand, three hundred nine".