139913 has 4 divisors (see below), whose sum is σ = 140868. Its totient is φ = 138960.

The previous prime is 139907. The next prime is 139921. The reversal of 139913 is 319931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4489 + 135424 = 67^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 139913 - 2¹⁰ = 138889 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (139943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206 + ... + 567.

It is an arithmetic number, because the mean of its divisors is an integer number (35217).

2¹³⁹⁹¹³ is an apocalyptic number.

It is an amenable number.

139913 is a deficient number, since it is larger than the sum of its proper divisors (955).

139913 is an equidigital number, since it uses as much as digits as its factorization.

139913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954.

The product of its digits is 729, while the sum is 26.

The square root of 139913 is about 374.0494619699. The cubic root of 139913 is about 51.9141829091.

The spelling of 139913 in words is "one hundred thirty-nine thousand, nine hundred thirteen".