208398813 has 12 divisors (see below), whose sum is σ = 323231040. Its totient is φ = 119084952.

The previous prime is 208398811. The next prime is 208398829. The reversal of 208398813 is 318893802.

It is not a de Polignac number, because 208398813 - 2¹ = 208398811 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208398811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 708693 + ... + 708986.

It is an arithmetic number, because the mean of its divisors is an integer number (26935920).

Almost surely, 2^208398813 is an apocalyptic number.

It is an amenable number.

208398813 is a deficient number, since it is larger than the sum of its proper divisors (114832227).

208398813 is a wasteful number, since it uses less digits than its factorization.

208398813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417696 (or 1417689 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 208398813 is about 14436.0248337276. The cubic root of 208398813 is about 592.8776520261.

The spelling of 208398813 in words is "two hundred eight million, three hundred ninety-eight thousand, eight hundred thirteen".