139545218 has 6 divisors (see below), whose sum is σ = 209342889. Its totient is φ = 69764256.

The previous prime is 139545157. The next prime is 139545221. The reversal of 139545218 is 812545931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 135885649 + 3659569 = 11657^2 + 1913^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8353.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12530 + ... + 20882.

Almost surely, 2^139545218 is an apocalyptic number.

139545218 is a deficient number, since it is larger than the sum of its proper divisors (69797671).

139545218 is an frugal number, since it uses more digits than its factorization.

139545218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16708 (or 8355 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 139545218 is about 11812.9258865025. The cubic root of 139545218 is about 518.6865495917.

The spelling of 139545218 in words is "one hundred thirty-nine million, five hundred forty-five thousand, two hundred eighteen".