209428559 has 8 divisors (see below), whose sum is σ = 222192720. Its totient is φ = 196713856.

The previous prime is 209428553. The next prime is 209428579. The reversal of 209428559 is 955824902.

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 209428559 - 2⁴ = 209428543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209428553) 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, 3449 + ... + 20754.

It is an arithmetic number, because the mean of its divisors is an integer number (27774090).

Almost surely, 2^209428559 is an apocalyptic number.

209428559 is a deficient number, since it is larger than the sum of its proper divisors (12764161).

209428559 is a wasteful number, since it uses less digits than its factorization.

209428559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24729.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 209428559 is about 14471.6467273078. The cubic root of 209428559 is about 593.8525625375.

The spelling of 209428559 in words is "two hundred nine million, four hundred twenty-eight thousand, five hundred fifty-nine".