139993 has 6 divisors (see below), whose sum is σ = 162906. Its totient is φ = 119952.

The previous prime is 139991. The next prime is 139999. The reversal of 139993 is 399931.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 127449 + 12544 = 357^2 + 112^2 .

It is not a de Polignac number, because 139993 - 2¹ = 139991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1380 + ... + 1477.

It is an arithmetic number, because the mean of its divisors is an integer number (27151).

2¹³⁹⁹⁹³ is an apocalyptic number.

It is an amenable number.

139993 is a deficient number, since it is larger than the sum of its proper divisors (22913).

139993 is an equidigital number, since it uses as much as digits as its factorization.

139993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2871 (or 2864 counting only the distinct ones).

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

The square root of 139993 is about 374.1563844170. The cubic root of 139993 is about 51.9240755884.

The spelling of 139993 in words is "one hundred thirty-nine thousand, nine hundred ninety-three".