139405 has 12 divisors (see below), whose sum is σ = 194940. Its totient is φ = 95424.

The previous prime is 139397. The next prime is 139409. The reversal of 139405 is 504931.

It can be written as a sum of positive squares in 2 ways, for example, as 35721 + 103684 = 189^2 + 322^2 .

It is not a de Polignac number, because 139405 - 2³ = 139397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40 + ... + 529.

It is an arithmetic number, because the mean of its divisors is an integer number (16245).

2¹³⁹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

139405 is a deficient number, since it is larger than the sum of its proper divisors (55535).

139405 is an equidigital number, since it uses as much as digits as its factorization.

139405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 139405 is about 373.3697898866. The cubic root of 139405 is about 51.8512762282.

It can be divided in two parts, 13 and 9405, that multiplied together give a triangular number (122265 = T₄₉₄).

The spelling of 139405 in words is "one hundred thirty-nine thousand, four hundred five".