139387 has 2 divisors, whose sum is σ = 139388. Its totient is φ = 139386.

The previous prime is 139369. The next prime is 139393. The reversal of 139387 is 783931.

It is a strong prime.

It is an emirp because it is prime and its reverse (783931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139387 - 2¹¹ = 137339 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139387.

It is not a weakly prime, because it can be changed into another prime (139367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69693 + 69694.

It is an arithmetic number, because the mean of its divisors is an integer number (69694).

2¹³⁹³⁸⁷ is an apocalyptic number.

139387 is a deficient number, since it is larger than the sum of its proper divisors (1).

139387 is an equidigital number, since it uses as much as digits as its factorization.

139387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 139387 is about 373.3456843195. The cubic root of 139387 is about 51.8490444499.

The spelling of 139387 in words is "one hundred thirty-nine thousand, three hundred eighty-seven".