139865506 has 16 divisors (see below), whose sum is σ = 230247360. Its totient is φ = 63192880.

The previous prime is 139865503. The next prime is 139865519. The reversal of 139865506 is 605568931.

139865506 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (139865503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15361 + ... + 22708.

It is an arithmetic number, because the mean of its divisors is an integer number (14390460).

Almost surely, 2^139865506 is an apocalyptic number.

139865506 is a deficient number, since it is larger than the sum of its proper divisors (90381854).

139865506 is a wasteful number, since it uses less digits than its factorization.

139865506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38249.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 139865506 is about 11826.4747917543. The cubic root of 139865506 is about 519.0830808869.

The spelling of 139865506 in words is "one hundred thirty-nine million, eight hundred sixty-five thousand, five hundred six".