208383989 has 4 divisors (see below), whose sum is σ = 227328000. Its totient is φ = 189439980.

The previous prime is 208383971. The next prime is 208383997. The reversal of 208383989 is 989383802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 208383989 - 2⁸ = 208383733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208383919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9471989 + ... + 9472010.

It is an arithmetic number, because the mean of its divisors is an integer number (56832000).

Almost surely, 2^208383989 is an apocalyptic number.

It is an amenable number.

208383989 is a deficient number, since it is larger than the sum of its proper divisors (18944011).

208383989 is a wasteful number, since it uses less digits than its factorization.

208383989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18944010.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 208383989 is about 14435.5113868543. The cubic root of 208383989 is about 592.8635940018.

The spelling of 208383989 in words is "two hundred eight million, three hundred eighty-three thousand, nine hundred eighty-nine".