208872639 has 12 divisors (see below), whose sum is σ = 302782272. Its totient is φ = 138751200.

The previous prime is 208872623. The next prime is 208872641. The reversal of 208872639 is 936278802.

208872639 is a `hidden beast` number, since 2 + 0 + 8 + 8 + 7 + 2 + 639 = 666.

It is not a de Polignac number, because 208872639 - 2⁴ = 208872623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 208872594 and 208872603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208872679) 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, 38767 + ... + 43824.

It is an arithmetic number, because the mean of its divisors is an integer number (25231856).

Almost surely, 2^208872639 is an apocalyptic number.

208872639 is a deficient number, since it is larger than the sum of its proper divisors (93909633).

208872639 is a wasteful number, since it uses less digits than its factorization.

208872639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82878 (or 82875 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 208872639 is about 14452.4267512415. The cubic root of 208872639 is about 593.3266440422.

The spelling of 208872639 in words is "two hundred eight million, eight hundred seventy-two thousand, six hundred thirty-nine".