139399 has 4 divisors (see below), whose sum is σ = 150136. Its totient is φ = 128664.

The previous prime is 139397. The next prime is 139409. The reversal of 139399 is 993931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993931 = 37 ⋅26863.

It is a cyclic number.

It is not a de Polignac number, because 139399 - 2¹ = 139397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139393) 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, 5349 + ... + 5374.

It is an arithmetic number, because the mean of its divisors is an integer number (37534).

2¹³⁹³⁹⁹ is an apocalyptic number.

139399 is a deficient number, since it is larger than the sum of its proper divisors (10737).

139399 is a wasteful number, since it uses less digits than its factorization.

139399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10736.

The product of its digits is 6561, while the sum is 34.

The square root of 139399 is about 373.3617548705. The cubic root of 139399 is about 51.8505323234.

The spelling of 139399 in words is "one hundred thirty-nine thousand, three hundred ninety-nine".