209420239 has 8 divisors (see below), whose sum is σ = 240923648. Its totient is φ = 178313400.

The previous prime is 209420219. The next prime is 209420249. The reversal of 209420239 is 932024902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 209420239 - 2¹¹ = 209418191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209420239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209420219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98007 + ... + 100120.

It is an arithmetic number, because the mean of its divisors is an integer number (30115456).

Almost surely, 2^209420239 is an apocalyptic number.

209420239 is a deficient number, since it is larger than the sum of its proper divisors (31503409).

209420239 is a wasteful number, since it uses less digits than its factorization.

209420239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198285.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 209420239 is about 14471.3592658050. The cubic root of 209420239 is about 593.8446984099.

The spelling of 209420239 in words is "two hundred nine million, four hundred twenty thousand, two hundred thirty-nine".