139243 has 4 divisors (see below), whose sum is σ = 149968. Its totient is φ = 128520.

The previous prime is 139241. The next prime is 139267. The reversal of 139243 is 342931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342931 = 19 ⋅18049.

It is a cyclic number.

It is not a de Polignac number, because 139243 - 2¹ = 139241 is a prime.

It is a super-2 number, since 2×139243² = 38777226098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139241) 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, 5343 + ... + 5368.

It is an arithmetic number, because the mean of its divisors is an integer number (37492).

2¹³⁹²⁴³ is an apocalyptic number.

139243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

139243 is a deficient number, since it is larger than the sum of its proper divisors (10725).

139243 is a wasteful number, since it uses less digits than its factorization.

139243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10724.

The product of its digits is 648, while the sum is 22.

The square root of 139243 is about 373.1527837227. The cubic root of 139243 is about 51.8311833031.

The spelling of 139243 in words is "one hundred thirty-nine thousand, two hundred forty-three".