139423 has 2 divisors, whose sum is σ = 139424. Its totient is φ = 139422.

The previous prime is 139409. The next prime is 139429. The reversal of 139423 is 324931.

It is a strong prime.

It is an emirp because it is prime and its reverse (324931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139423 - 2¹³ = 131231 is a prime.

139423 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 139394 and 139403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69711 + 69712.

It is an arithmetic number, because the mean of its divisors is an integer number (69712).

2¹³⁹⁴²³ is an apocalyptic number.

139423 is a deficient number, since it is larger than the sum of its proper divisors (1).

139423 is an equidigital number, since it uses as much as digits as its factorization.

139423 is an evil number, because the sum of its binary digits is even.

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

The square root of 139423 is about 373.3938938976. The cubic root of 139423 is about 51.8535078143.

The spelling of 139423 in words is "one hundred thirty-nine thousand, four hundred twenty-three".