139643 has 4 divisors (see below), whose sum is σ = 159600. Its totient is φ = 119688.

The previous prime is 139627. The next prime is 139661. The reversal of 139643 is 346931.

139643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346931 = 13 ⋅26687.

It is a cyclic number.

It is not a de Polignac number, because 139643 - 2⁴ = 139627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139663) 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, 9968 + ... + 9981.

It is an arithmetic number, because the mean of its divisors is an integer number (39900).

2¹³⁹⁶⁴³ is an apocalyptic number.

139643 is a deficient number, since it is larger than the sum of its proper divisors (19957).

139643 is an equidigital number, since it uses as much as digits as its factorization.

139643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19956.

The product of its digits is 1944, while the sum is 26.

The square root of 139643 is about 373.6883728456. The cubic root of 139643 is about 51.8807672496.

The spelling of 139643 in words is "one hundred thirty-nine thousand, six hundred forty-three".