208144136 has 24 divisors (see below), whose sum is σ = 404204970. Its totient is φ = 100480128.

The previous prime is 208144127. The next prime is 208144159. The reversal of 208144136 is 631441802.

It can be written as a sum of positive squares in 3 ways, for example, as 144240100 + 63904036 = 12010^2 + 7994^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 208144099 and 208144108.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8741 + ... + 22196.

Almost surely, 2^208144136 is an apocalyptic number.

It is an amenable number.

208144136 is a deficient number, since it is larger than the sum of its proper divisors (196060834).

208144136 is a wasteful number, since it uses less digits than its factorization.

208144136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31001 (or 30968 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 208144136 is about 14427.2012531884. The cubic root of 208144136 is about 592.6360418030.

Adding to 208144136 its reverse (631441802), we get a palindrome (839585938).

The spelling of 208144136 in words is "two hundred eight million, one hundred forty-four thousand, one hundred thirty-six".