145842239 has 4 divisors (see below), whose sum is σ = 146112360. Its totient is φ = 145572120.

The previous prime is 145842217. The next prime is 145842329. The reversal of 145842239 is 932248541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932248541 = 7 ⋅133178363.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145842239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145842209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134249 + ... + 135330.

It is an arithmetic number, because the mean of its divisors is an integer number (36528090).

Almost surely, 2^145842239 is an apocalyptic number.

145842239 is a deficient number, since it is larger than the sum of its proper divisors (270121).

145842239 is an equidigital number, since it uses as much as digits as its factorization.

145842239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270120.

The product of its digits is 69120, while the sum is 38.

The square root of 145842239 is about 12076.5160124930. The cubic root of 145842239 is about 526.3740141377.

The spelling of 145842239 in words is "one hundred forty-five million, eight hundred forty-two thousand, two hundred thirty-nine".