208393997 has 8 divisors (see below), whose sum is σ = 245847552. Its totient is φ = 172861200.

The previous prime is 208393963. The next prime is 208394009. The reversal of 208393997 is 799393802.

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 208393997 - 2²⁰ = 207345421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208393907) 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, 479954 + ... + 480387.

It is an arithmetic number, because the mean of its divisors is an integer number (30730944).

Almost surely, 2^208393997 is an apocalyptic number.

It is an amenable number.

208393997 is a deficient number, since it is larger than the sum of its proper divisors (37453555).

208393997 is an equidigital number, since it uses as much as digits as its factorization.

208393997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960379.

The product of its (nonzero) digits is 734832, while the sum is 50.

The square root of 208393997 is about 14435.8580278416. The cubic root of 208393997 is about 592.8730849483.

The spelling of 208393997 in words is "two hundred eight million, three hundred ninety-three thousand, nine hundred ninety-seven".