729145 has 4 divisors (see below), whose sum is σ = 874980. Its totient is φ = 583312.

The previous prime is 729143. The next prime is 729173. The reversal of 729145 is 541927.

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 157609 + 571536 = 397^2 + 756^2 .

It is a cyclic number.

It is not a de Polignac number, because 729145 - 2¹ = 729143 is a prime.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (729143) 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, 72910 + ... + 72919.

It is an arithmetic number, because the mean of its divisors is an integer number (218745).

2⁷²⁹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

729145 is a deficient number, since it is larger than the sum of its proper divisors (145835).

729145 is a wasteful number, since it uses less digits than its factorization.

729145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145834.

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

The square root of 729145 is about 853.8998770348. The cubic root of 729145 is about 90.0059666826.

The spelling of 729145 in words is "seven hundred twenty-nine thousand, one hundred forty-five".