209942073 has 24 divisors (see below), whose sum is σ = 331624800. Its totient is φ = 126927360.

The previous prime is 209942069. The next prime is 209942111. The reversal of 209942073 is 370249902.

209942073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 209942073 - 2² = 209942069 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (209942003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42090 + ... + 46812.

It is an arithmetic number, because the mean of its divisors is an integer number (13817700).

Almost surely, 2^209942073 is an apocalyptic number.

It is an amenable number.

209942073 is a deficient number, since it is larger than the sum of its proper divisors (121682727).

209942073 is a wasteful number, since it uses less digits than its factorization.

209942073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5189 (or 5186 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 209942073 is about 14489.3779369578. The cubic root of 209942073 is about 594.3375373032.

The spelling of 209942073 in words is "two hundred nine million, nine hundred forty-two thousand, seventy-three".