145717439 has 4 divisors (see below), whose sum is σ = 166534224. Its totient is φ = 124900656.

The previous prime is 145717427. The next prime is 145717459. The reversal of 145717439 is 934717541.

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 145717439 - 2⁴ = 145717423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145717396 and 145717405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145717409) 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, 10408382 + ... + 10408395.

It is an arithmetic number, because the mean of its divisors is an integer number (41633556).

Almost surely, 2^145717439 is an apocalyptic number.

145717439 is a deficient number, since it is larger than the sum of its proper divisors (20816785).

145717439 is an equidigital number, since it uses as much as digits as its factorization.

145717439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20816784.

The product of its digits is 105840, while the sum is 41.

The square root of 145717439 is about 12071.3478534918. The cubic root of 145717439 is about 526.2238285121.

The spelling of 145717439 in words is "one hundred forty-five million, seven hundred seventeen thousand, four hundred thirty-nine".