208905472 has 18 divisors (see below), whose sum is σ = 416995418. Its totient is φ = 104452608.

The previous prime is 208905461. The next prime is 208905491. The reversal of 208905472 is 274509802.

It can be written as a sum of positive squares in only one way, i.e., 151388416 + 57517056 = 12304^2 + 7584^2 .

It is a congruent number.

It is an unprimeable number.

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, 407763 + ... + 408274.

Almost surely, 2^208905472 is an apocalyptic number.

It is an amenable number.

208905472 is a deficient number, since it is larger than the sum of its proper divisors (208089946).

208905472 is an frugal number, since it uses more digits than its factorization.

208905472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816053 (or 816039 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 208905472 is about 14453.5626058076. The cubic root of 208905472 is about 593.3577310452.

It can be divided in two parts, 20890 and 5472, that added together give a palindrome (26362).

The spelling of 208905472 in words is "two hundred eight million, nine hundred five thousand, four hundred seventy-two".