209079642 has 16 divisors (see below), whose sum is σ = 418300992. Its totient is φ = 69669600.

The previous prime is 209079613. The next prime is 209079643. The reversal of 209079642 is 246970902.

It is a self number, because there is not a number n which added to its sum of digits gives 209079642.

It is not an unprimeable number, because it can be changed into a prime (209079643) 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, 31803 + ... + 37809.

It is an arithmetic number, because the mean of its divisors is an integer number (26143812).

Almost surely, 2^209079642 is an apocalyptic number.

209079642 is an abundant number, since it is smaller than the sum of its proper divisors (209221350).

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

209079642 is a wasteful number, since it uses less digits than its factorization.

209079642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11813.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 209079642 is about 14459.5865086108. The cubic root of 209079642 is about 593.5225845677.

The spelling of 209079642 in words is "two hundred nine million, seventy-nine thousand, six hundred forty-two".