139739 has 2 divisors, whose sum is σ = 139740. Its totient is φ = 139738.

The previous prime is 139729. The next prime is 139747. The reversal of 139739 is 937931.

It is a happy number.

139739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139739 - 2⁸ = 139483 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (139709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69869 + 69870.

It is an arithmetic number, because the mean of its divisors is an integer number (69870).

2¹³⁹⁷³⁹ is an apocalyptic number.

139739 is a deficient number, since it is larger than the sum of its proper divisors (1).

139739 is an equidigital number, since it uses as much as digits as its factorization.

139739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5103, while the sum is 32.

The square root of 139739 is about 373.8168000505. The cubic root of 139739 is about 51.8926533038.

It can be divided in two parts, 139 and 739, that added together give a palindrome (878).

The spelling of 139739 in words is "one hundred thirty-nine thousand, seven hundred thirty-nine".