145239 has 4 divisors (see below), whose sum is σ = 193656. Its totient is φ = 96824.

The previous prime is 145219. The next prime is 145253. The reversal of 145239 is 932541.

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 145239 - 2⁵ = 145207 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24204 + ... + 24209.

It is an arithmetic number, because the mean of its divisors is an integer number (48414).

2¹⁴⁵²³⁹ is an apocalyptic number.

145239 is a deficient number, since it is larger than the sum of its proper divisors (48417).

145239 is an equidigital number, since it uses as much as digits as its factorization.

145239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48416.

The product of its digits is 1080, while the sum is 24.

The square root of 145239 is about 381.1023484577. The cubic root of 145239 is about 52.5647274208.

It can be divided in two parts, 14 and 5239, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 145239 in words is "one hundred forty-five thousand, two hundred thirty-nine".