209572029 has 20 divisors (see below), whose sum is σ = 313542460. Its totient is φ = 139501440.

The previous prime is 209572007. The next prime is 209572043. The reversal of 209572029 is 920275902.

It can be written as a sum of positive squares in 2 ways, for example, as 38564100 + 171007929 = 6210^2 + 13077^2 .

It is not a de Polignac number, because 209572029 - 2⁸ = 209571773 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209571984 and 209572002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209572079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 65589 + ... + 68709.

It is an arithmetic number, because the mean of its divisors is an integer number (15677123).

Almost surely, 2^209572029 is an apocalyptic number.

It is an amenable number.

209572029 is a deficient number, since it is larger than the sum of its proper divisors (103970431).

209572029 is an equidigital number, since it uses as much as digits as its factorization.

209572029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3962 (or 3953 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 209572029 is about 14476.6028128149. The cubic root of 209572029 is about 593.9881387286.

The spelling of 209572029 in words is "two hundred nine million, five hundred seventy-two thousand, twenty-nine".