139865387 has 2 divisors, whose sum is σ = 139865388. Its totient is φ = 139865386.

The previous prime is 139865353. The next prime is 139865393. The reversal of 139865387 is 783568931.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (783568931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139865387 - 2²² = 135671083 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139865287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69932693 + 69932694.

It is an arithmetic number, because the mean of its divisors is an integer number (69932694).

Almost surely, 2^139865387 is an apocalyptic number.

139865387 is a deficient number, since it is larger than the sum of its proper divisors (1).

139865387 is an equidigital number, since it uses as much as digits as its factorization.

139865387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 50.

The square root of 139865387 is about 11826.4697606682. The cubic root of 139865387 is about 519.0829336719.

The spelling of 139865387 in words is "one hundred thirty-nine million, eight hundred sixty-five thousand, three hundred eighty-seven".