73868209 has 2 divisors, whose sum is σ = 73868210. Its totient is φ = 73868208.

The previous prime is 73868141. The next prime is 73868227. The reversal of 73868209 is 90286837.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68939809 + 4928400 = 8303^2 + 2220^2 .

It is an emirp because it is prime and its reverse (90286837) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73868209 - 2²¹ = 71771057 is a prime.

It is not a weakly prime, because it can be changed into another prime (73868279) 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, 36934104 + 36934105.

It is an arithmetic number, because the mean of its divisors is an integer number (36934105).

Almost surely, 2^73868209 is an apocalyptic number.

It is an amenable number.

73868209 is a deficient number, since it is larger than the sum of its proper divisors (1).

73868209 is an equidigital number, since it uses as much as digits as its factorization.

73868209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 73868209 is about 8594.6616570986. The cubic root of 73868209 is about 419.5842617074.

The spelling of 73868209 in words is "seventy-three million, eight hundred sixty-eight thousand, two hundred nine".