145729 has 4 divisors (see below), whose sum is σ = 148180. Its totient is φ = 143280.

The previous prime is 145723. The next prime is 145753. The reversal of 145729 is 927541.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16129 + 129600 = 127^2 + 360^2 .

It is a cyclic number.

It is not a de Polignac number, because 145729 - 2³ = 145721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145697 and 145706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1134 + ... + 1255.

It is an arithmetic number, because the mean of its divisors is an integer number (37045).

2¹⁴⁵⁷²⁹ is an apocalyptic number.

It is an amenable number.

145729 is a deficient number, since it is larger than the sum of its proper divisors (2451).

145729 is an equidigital number, since it uses as much as digits as its factorization.

145729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2450.

The product of its digits is 2520, while the sum is 28.

The square root of 145729 is about 381.7446790723. The cubic root of 145729 is about 52.6237744743.

The spelling of 145729 in words is "one hundred forty-five thousand, seven hundred twenty-nine".