139865139 has 24 divisors (see below), whose sum is σ = 211330080. Its totient is φ = 88970112.

The previous prime is 139865129. The next prime is 139865147. The reversal of 139865139 is 931568931.

It is not a de Polignac number, because 139865139 - 2⁴ = 139865123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139865094 and 139865103.

It is not an unprimeable number, because it can be changed into a prime (139865129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146287 + ... + 147239.

It is an arithmetic number, because the mean of its divisors is an integer number (8805420).

Almost surely, 2^139865139 is an apocalyptic number.

139865139 is a deficient number, since it is larger than the sum of its proper divisors (71464941).

139865139 is a wasteful number, since it uses less digits than its factorization.

139865139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691 (or 1688 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 139865139 is about 11826.4592757089. The cubic root of 139865139 is about 519.0826268706.

The spelling of 139865139 in words is "one hundred thirty-nine million, eight hundred sixty-five thousand, one hundred thirty-nine".