208240137 has 48 divisors (see below), whose sum is σ = 361670400. Its totient is φ = 112882176.

The previous prime is 208240117. The next prime is 208240139. The reversal of 208240137 is 731042802.

208240137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 208240137 - 2⁶ = 208240073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 208240137.

It is not an unprimeable number, because it can be changed into a prime (208240139) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 197989 + ... + 199037.

It is an arithmetic number, because the mean of its divisors is an integer number (7534800).

Almost surely, 2^208240137 is an apocalyptic number.

It is an amenable number.

208240137 is a deficient number, since it is larger than the sum of its proper divisors (153430263).

208240137 is a wasteful number, since it uses less digits than its factorization.

208240137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222 (or 1219 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 208240137 is about 14430.5279529198. The cubic root of 208240137 is about 592.7271403867.

Adding to 208240137 its reverse (731042802), we get a palindrome (939282939).

The spelling of 208240137 in words is "two hundred eight million, two hundred forty thousand, one hundred thirty-seven".