209439413 has 16 divisors (see below), whose sum is σ = 225699840. Its totient is φ = 193752000.

The previous prime is 209439407. The next prime is 209439443. The reversal of 209439413 is 314934902.

It is a cyclic number.

It is not a de Polignac number, because 209439413 - 2⁸ = 209439157 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 (209439443) 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 15 ways as a sum of consecutive naturals, for example, 181388 + ... + 182538.

It is an arithmetic number, because the mean of its divisors is an integer number (14106240).

Almost surely, 2^209439413 is an apocalyptic number.

It is an amenable number.

209439413 is a deficient number, since it is larger than the sum of its proper divisors (16260427).

209439413 is a wasteful number, since it uses less digits than its factorization.

209439413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 209439413 is about 14472.0217316034. The cubic root of 209439413 is about 593.8628215082.

The spelling of 209439413 in words is "two hundred nine million, four hundred thirty-nine thousand, four hundred thirteen".