1723729 has 4 divisors (see below), whose sum is σ = 1969984. Its totient is φ = 1477476.

The previous prime is 1723727. The next prime is 1723747. The reversal of 1723729 is 9273271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9273271 = 7 ⋅1324753.

It is not a de Polignac number, because 1723729 - 2¹ = 1723727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1723729.

It is not an unprimeable number, because it can be changed into a prime (1723721) 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, 123117 + ... + 123130.

It is an arithmetic number, because the mean of its divisors is an integer number (492496).

2^1723729 is an apocalyptic number.

It is an amenable number.

1723729 is a deficient number, since it is larger than the sum of its proper divisors (246255).

1723729 is an equidigital number, since it uses as much as digits as its factorization.

1723729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246254.

The product of its digits is 5292, while the sum is 31.

The square root of 1723729 is about 1312.9086030642. The cubic root of 1723729 is about 119.9010526936.

The spelling of 1723729 in words is "one million, seven hundred twenty-three thousand, seven hundred twenty-nine".