209109342 has 64 divisors (see below), whose sum is σ = 464970240. Its totient is φ = 62294400.

The previous prime is 209109337. The next prime is 209109347. The reversal of 209109342 is 243901902.

It is an interprime number because it is at equal distance from previous prime (209109337) and next prime (209109347).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209109347) 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, 337509 + ... + 338127.

It is an arithmetic number, because the mean of its divisors is an integer number (7265160).

Almost surely, 2^209109342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209109342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232485120).

209109342 is an abundant number, since it is smaller than the sum of its proper divisors (255860898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209109342 is a wasteful number, since it uses less digits than its factorization.

209109342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 209109342 is about 14460.6134724637. The cubic root of 209109342 is about 593.5506867556.

The spelling of 209109342 in words is "two hundred nine million, one hundred nine thousand, three hundred forty-two".