208396397 has 4 divisors (see below), whose sum is σ = 227341536. Its totient is φ = 189451260.

The previous prime is 208396393. The next prime is 208396411. The reversal of 208396397 is 793693802.

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 208396397 - 2² = 208396393 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 (208396393) 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, 9472553 + ... + 9472574.

It is an arithmetic number, because the mean of its divisors is an integer number (56835384).

Almost surely, 2^208396397 is an apocalyptic number.

It is an amenable number.

208396397 is a deficient number, since it is larger than the sum of its proper divisors (18945139).

208396397 is a wasteful number, since it uses less digits than its factorization.

208396397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18945138.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 208396397 is about 14435.9411539394. The cubic root of 208396397 is about 592.8753609095.

The spelling of 208396397 in words is "two hundred eight million, three hundred ninety-six thousand, three hundred ninety-seven".