208212138 has 12 divisors (see below), whose sum is σ = 451126338. Its totient is φ = 69404040.

The previous prime is 208212119. The next prime is 208212167. The reversal of 208212138 is 831212802.

It can be written as a sum of positive squares in only one way, i.e., 183142089 + 25070049 = 13533^2 + 5007^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5783653 + ... + 5783688.

Almost surely, 2^208212138 is an apocalyptic number.

208212138 is an abundant number, since it is smaller than the sum of its proper divisors (242914200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208212138 is a wasteful number, since it uses less digits than its factorization.

208212138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11567349 (or 11567346 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 208212138 is about 14429.5577894820. The cubic root of 208212138 is about 592.7005740848.

The spelling of 208212138 in words is "two hundred eight million, two hundred twelve thousand, one hundred thirty-eight".