209305083 has 32 divisors (see below), whose sum is σ = 330140160. Its totient is φ = 116709120.

The previous prime is 209305081. The next prime is 209305097. The reversal of 209305083 is 380503902.

It is a happy number.

It is not a de Polignac number, because 209305083 - 2¹ = 209305081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209305083.

It is not an unprimeable number, because it can be changed into a prime (209305081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10903 + ... + 23183.

It is an arithmetic number, because the mean of its divisors is an integer number (10316880).

Almost surely, 2^209305083 is an apocalyptic number.

209305083 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

209305083 is a deficient number, since it is larger than the sum of its proper divisors (120835077).

209305083 is a wasteful number, since it uses less digits than its factorization.

209305083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12339.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 209305083 is about 14467.3799632138. The cubic root of 209305083 is about 593.7358306794.

Adding to 209305083 its reverse (380503902), we get a palindrome (589808985).

The spelling of 209305083 in words is "two hundred nine million, three hundred five thousand, eighty-three".