1830729 has 4 divisors (see below), whose sum is σ = 2440976. Its totient is φ = 1220484.

The previous prime is 1830701. The next prime is 1830733. The reversal of 1830729 is 9270381.

It is a happy number.

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: 9270381 = 3 ⋅3090127.

It is not a de Polignac number, because 1830729 - 2¹¹ = 1828681 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1830696 and 1830705.

It is not an unprimeable number, because it can be changed into a prime (1830739) 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, 305119 + ... + 305124.

It is an arithmetic number, because the mean of its divisors is an integer number (610244).

2^1830729 is an apocalyptic number.

It is an amenable number.

1830729 is a deficient number, since it is larger than the sum of its proper divisors (610247).

1830729 is an equidigital number, since it uses as much as digits as its factorization.

1830729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610246.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 1830729 is about 1353.0443451713. The cubic root of 1830729 is about 122.3323598897.

It can be divided in two parts, 18307 and 29, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 1830729 in words is "one million, eight hundred thirty thousand, seven hundred twenty-nine".