208398857 has 4 divisors (see below), whose sum is σ = 208513536. Its totient is φ = 208284180.

The previous prime is 208398847. The next prime is 208398863. The reversal of 208398857 is 758893802.

208398857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 208398857 - 2⁶ = 208398793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208398847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54569 + ... + 58262.

It is an arithmetic number, because the mean of its divisors is an integer number (52128384).

Almost surely, 2^208398857 is an apocalyptic number.

It is an amenable number.

208398857 is a deficient number, since it is larger than the sum of its proper divisors (114679).

208398857 is a wasteful number, since it uses less digits than its factorization.

208398857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114678.

The product of its (nonzero) digits is 967680, while the sum is 50.

The square root of 208398857 is about 14436.0263576928. The cubic root of 208398857 is about 592.8776937515.

The spelling of 208398857 in words is "two hundred eight million, three hundred ninety-eight thousand, eight hundred fifty-seven".