312729 has 4 divisors (see below), whose sum is σ = 416976. Its totient is φ = 208484.

The previous prime is 312727. The next prime is 312737. The reversal of 312729 is 927213.

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 a cyclic number.

It is not a de Polignac number, because 312729 - 2¹ = 312727 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 312699 and 312708.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 312729.

It is not an unprimeable number, because it can be changed into a prime (312727) 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, 52119 + ... + 52124.

It is an arithmetic number, because the mean of its divisors is an integer number (104244).

2³¹²⁷²⁹ is an apocalyptic number.

It is an amenable number.

312729 is a deficient number, since it is larger than the sum of its proper divisors (104247).

312729 is a wasteful number, since it uses less digits than its factorization.

312729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104246.

The product of its digits is 756, while the sum is 24.

The square root of 312729 is about 559.2217806917. The cubic root of 312729 is about 67.8770124111.

The spelling of 312729 in words is "three hundred twelve thousand, seven hundred twenty-nine".