705729 has 4 divisors (see below), whose sum is σ = 940976. Its totient is φ = 470484.

The previous prime is 705713. The next prime is 705737. The reversal of 705729 is 927507.

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.

It is not a de Polignac number, because 705729 - 2⁴ = 705713 is a prime.

It is a D-number.

It is a Duffinian number.

705729 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 705696 and 705705.

It is not an unprimeable number, because it can be changed into a prime (705769) 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, 117619 + ... + 117624.

It is an arithmetic number, because the mean of its divisors is an integer number (235244).

2⁷⁰⁵⁷²⁹ is an apocalyptic number.

It is an amenable number.

705729 is a deficient number, since it is larger than the sum of its proper divisors (235247).

705729 is a wasteful number, since it uses less digits than its factorization.

705729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235246.

The product of its (nonzero) digits is 4410, while the sum is 30.

The square root of 705729 is about 840.0767822051. The cubic root of 705729 is about 89.0319710076.

The spelling of 705729 in words is "seven hundred five thousand, seven hundred twenty-nine".