208285993 has 8 divisors (see below), whose sum is σ = 215806976. Its totient is φ = 200815200.

The previous prime is 208285981. The next prime is 208285997. The reversal of 208285993 is 399582802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 208285993 - 2¹³ = 208277801 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (208285997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3996 + ... + 20797.

It is an arithmetic number, because the mean of its divisors is an integer number (26975872).

Almost surely, 2^208285993 is an apocalyptic number.

It is an amenable number.

208285993 is a deficient number, since it is larger than the sum of its proper divisors (7520983).

208285993 is a wasteful number, since it uses less digits than its factorization.

208285993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25095.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 208285993 is about 14432.1167193174. The cubic root of 208285993 is about 592.7706448095.

The spelling of 208285993 in words is "two hundred eight million, two hundred eighty-five thousand, nine hundred ninety-three".