30729 has 4 divisors (see below), whose sum is σ = 40976. Its totient is φ = 20484.

The previous prime is 30727. The next prime is 30757. The reversal of 30729 is 92703.

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.

It is not a de Polignac number, because 30729 - 2¹ = 30727 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 not an unprimeable number, because it can be changed into a prime (30727) 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, 5119 + ... + 5124.

It is an arithmetic number, because the mean of its divisors is an integer number (10244).

2³⁰⁷²⁹ is an apocalyptic number.

It is an amenable number.

30729 is a deficient number, since it is larger than the sum of its proper divisors (10247).

30729 is a wasteful number, since it uses less digits than its factorization.

30729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10246.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 30729 is about 175.2968910164. The cubic root of 30729 is about 31.3219993211.

It can be divided in two parts, 3072 and 9, that added together give a triangular number (3081 = T₇₈).

The spelling of 30729 in words is "thirty thousand, seven hundred twenty-nine".