243729 has 24 divisors (see below), whose sum is σ = 393120. Its totient is φ = 150336.

The previous prime is 243709. The next prime is 243769. The reversal of 243729 is 927342.

It is not a de Polignac number, because 243729 - 2⁸ = 243473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

243729 is a modest number, since divided by 729 gives 243 as remainder.

It is not an unprimeable number, because it can be changed into a prime (243709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4102 + ... + 4160.

It is an arithmetic number, because the mean of its divisors is an integer number (16380).

2²⁴³⁷²⁹ is an apocalyptic number.

It is an amenable number.

243729 is a deficient number, since it is larger than the sum of its proper divisors (149391).

243729 is an equidigital number, since it uses as much as digits as its factorization.

243729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 79 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 243729 is about 493.6891734685. The cubic root of 243729 is about 62.4648549075.

Adding to 243729 its product of digits (3024), we get a triangular number (246753 = T₇₀₂).

It can be divided in two parts, 243 and 729, that multiplied together give a 11-th power (177147 = 3¹¹).

The spelling of 243729 in words is "two hundred forty-three thousand, seven hundred twenty-nine".