209052789 has 12 divisors (see below), whose sum is σ = 306380928. Its totient is φ = 126698440.

The previous prime is 209052787. The next prime is 209052841. The reversal of 209052789 is 987250902.

It is not a de Polignac number, because 209052789 - 2¹ = 209052787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209052789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209052787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 287589 + ... + 288314.

It is an arithmetic number, because the mean of its divisors is an integer number (25531744).

Almost surely, 2^209052789 is an apocalyptic number.

It is an amenable number.

209052789 is a deficient number, since it is larger than the sum of its proper divisors (97328139).

209052789 is a wasteful number, since it uses less digits than its factorization.

209052789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575928 (or 575917 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 209052789 is about 14458.6579252709. The cubic root of 209052789 is about 593.4971739248.

The spelling of 209052789 in words is "two hundred nine million, fifty-two thousand, seven hundred eighty-nine".