209229429 has 4 divisors (see below), whose sum is σ = 278972576. Its totient is φ = 139486284.

The previous prime is 209229373. The next prime is 209229431. The reversal of 209229429 is 924922902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 209229429 - 2⁷ = 209229301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209229439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34871569 + ... + 34871574.

It is an arithmetic number, because the mean of its divisors is an integer number (69743144).

Almost surely, 2^209229429 is an apocalyptic number.

It is an amenable number.

209229429 is a deficient number, since it is larger than the sum of its proper divisors (69743147).

209229429 is an equidigital number, since it uses as much as digits as its factorization.

209229429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69743146.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 209229429 is about 14464.7650862363. The cubic root of 209229429 is about 593.6642861459.

The spelling of 209229429 in words is "two hundred nine million, two hundred twenty-nine thousand, four hundred twenty-nine".