209209130 has 16 divisors (see below), whose sum is σ = 405544104. Its totient is φ = 77246400.

The previous prime is 209209129. The next prime is 209209151. The reversal of 209209130 is 31902902.

It can be written as a sum of positive squares in 4 ways, for example, as 100861849 + 108347281 = 10043^2 + 10409^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 209209130.

It is an unprimeable number.

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, 804521 + ... + 804780.

Almost surely, 2^209209130 is an apocalyptic number.

209209130 is a deficient number, since it is larger than the sum of its proper divisors (196334974).

209209130 is a wasteful number, since it uses less digits than its factorization.

209209130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609321.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 209209130 is about 14464.0633986442. The cubic root of 209209130 is about 593.6450868373.

The spelling of 209209130 in words is "two hundred nine million, two hundred nine thousand, one hundred thirty".