209804474 has 16 divisors (see below), whose sum is σ = 344951136. Its totient is φ = 94911600.

The previous prime is 209804461. The next prime is 209804489. The reversal of 209804474 is 474408902.

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, 17957 + ... + 27240.

It is an arithmetic number, because the mean of its divisors is an integer number (21559446).

Almost surely, 2^209804474 is an apocalyptic number.

209804474 is a deficient number, since it is larger than the sum of its proper divisors (135146662).

209804474 is a wasteful number, since it uses less digits than its factorization.

209804474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45421.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 209804474 is about 14484.6288872032. The cubic root of 209804474 is about 594.2076631864.

The spelling of 209804474 in words is "two hundred nine million, eight hundred four thousand, four hundred seventy-four".