208305243 has 16 divisors (see below), whose sum is σ = 311600640. Its totient is φ = 137520072.

The previous prime is 208305241. The next prime is 208305247. The reversal of 208305243 is 342503802.

It is not a de Polignac number, because 208305243 - 2¹ = 208305241 is a prime.

It is a super-2 number, since 2×208305243² = 86782148522578098, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (208305241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34671 + ... + 40232.

It is an arithmetic number, because the mean of its divisors is an integer number (19475040).

Almost surely, 2^208305243 is an apocalyptic number.

208305243 is a deficient number, since it is larger than the sum of its proper divisors (103295397).

208305243 is a wasteful number, since it uses less digits than its factorization.

208305243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75015 (or 75009 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 208305243 is about 14432.7836192468. The cubic root of 208305243 is about 592.7889057325.

The spelling of 208305243 in words is "two hundred eight million, three hundred five thousand, two hundred forty-three".