209906229 has 8 divisors (see below), whose sum is σ = 301403872. Its totient is φ = 129173040.

The previous prime is 209906173. The next prime is 209906231. The reversal of 209906229 is 922609902.

It is a happy number.

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

It is not a de Polignac number, because 209906229 - 2¹¹ = 209904181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 5382211 = 209906229 / (2 + 0 + 9 + 9 + 0 + 6 + 2 + 2 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209906269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2691067 + ... + 2691144.

It is an arithmetic number, because the mean of its divisors is an integer number (37675484).

Almost surely, 2^209906229 is an apocalyptic number.

It is an amenable number.

209906229 is a deficient number, since it is larger than the sum of its proper divisors (91497643).

209906229 is a wasteful number, since it uses less digits than its factorization.

209906229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382227.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 209906229 is about 14488.1409780551. The cubic root of 209906229 is about 594.3037110722.

The spelling of 209906229 in words is "two hundred nine million, nine hundred six thousand, two hundred twenty-nine".