208971394 has 4 divisors (see below), whose sum is σ = 313457094. Its totient is φ = 104485696.

The previous prime is 208971359. The next prime is 208971401. The reversal of 208971394 is 493179802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 204919225 + 4052169 = 14315^2 + 2013^2 .

It is a super-4 number, since 4×208971394⁴ (a number of 34 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 208971394.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52242847 + ... + 52242850.

Almost surely, 2^208971394 is an apocalyptic number.

208971394 is a deficient number, since it is larger than the sum of its proper divisors (104485700).

208971394 is a wasteful number, since it uses less digits than its factorization.

208971394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104485699.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 208971394 is about 14455.8429017474. The cubic root of 208971394 is about 593.4201376037.

The spelling of 208971394 in words is "two hundred eight million, nine hundred seventy-one thousand, three hundred ninety-four".