209340045 has 40 divisors (see below), whose sum is σ = 376489080. Its totient is φ = 111283200.

The previous prime is 209340041. The next prime is 209340073. The reversal of 209340045 is 540043902.

209340045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 114511401 + 94828644 = 10701^2 + 9738^2 .

It is not a de Polignac number, because 209340045 - 2² = 209340041 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209340041) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 161761 + ... + 163049.

It is an arithmetic number, because the mean of its divisors is an integer number (9412227).

Almost surely, 2^209340045 is an apocalyptic number.

It is an amenable number.

209340045 is a deficient number, since it is larger than the sum of its proper divisors (167149035).

209340045 is a wasteful number, since it uses less digits than its factorization.

209340045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707 (or 1698 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 209340045 is about 14468.5882172381. The cubic root of 209340045 is about 593.7688877463.

Adding to 209340045 its reverse (540043902), we get a palindrome (749383947).

The spelling of 209340045 in words is "two hundred nine million, three hundred forty thousand, forty-five".