139493 has 2 divisors, whose sum is σ = 139494. Its totient is φ = 139492.

The previous prime is 139487. The next prime is 139501. The reversal of 139493 is 394931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124609 + 14884 = 353^2 + 122^2 .

It is an emirp because it is prime and its reverse (394931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139493 - 2⁶ = 139429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69746 + 69747.

It is an arithmetic number, because the mean of its divisors is an integer number (69747).

2¹³⁹⁴⁹³ is an apocalyptic number.

It is an amenable number.

139493 is a deficient number, since it is larger than the sum of its proper divisors (1).

139493 is an equidigital number, since it uses as much as digits as its factorization.

139493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 29.

The square root of 139493 is about 373.4876169299. The cubic root of 139493 is about 51.8621843795.

The spelling of 139493 in words is "one hundred thirty-nine thousand, four hundred ninety-three".