209104904 has 8 divisors (see below), whose sum is σ = 392071710. Its totient is φ = 104552448.

The previous prime is 209104901. The next prime is 209104933. The reversal of 209104904 is 409401902.

It can be written as a sum of positive squares in only one way, i.e., 196840900 + 12264004 = 14030^2 + 3502^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (209104901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13069049 + ... + 13069064.

Almost surely, 2^209104904 is an apocalyptic number.

It is an amenable number.

209104904 is a deficient number, since it is larger than the sum of its proper divisors (182966806).

209104904 is a wasteful number, since it uses less digits than its factorization.

209104904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26138119 (or 26138115 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 209104904 is about 14460.4600203451. The cubic root of 209104904 is about 593.5464876819.

The spelling of 209104904 in words is "two hundred nine million, one hundred four thousand, nine hundred four".