139823 has 4 divisors (see below), whose sum is σ = 143640. Its totient is φ = 136008.

The previous prime is 139813. The next prime is 139831. The reversal of 139823 is 328931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139823 - 2⁶ = 139759 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12 and base 16.

It is a junction number, because it is equal to n+sod(n) for n = 139792 and 139801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139813) 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, 1853 + ... + 1926.

It is an arithmetic number, because the mean of its divisors is an integer number (35910).

2¹³⁹⁸²³ is an apocalyptic number.

139823 is a deficient number, since it is larger than the sum of its proper divisors (3817).

139823 is an equidigital number, since it uses as much as digits as its factorization.

139823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3816.

The product of its digits is 1296, while the sum is 26.

The square root of 139823 is about 373.9291376718. The cubic root of 139823 is about 51.9030491363.

The spelling of 139823 in words is "one hundred thirty-nine thousand, eight hundred twenty-three".