427729 has 4 divisors (see below), whose sum is σ = 429040. Its totient is φ = 426420.

The previous prime is 427727. The next prime is 427733. The reversal of 427729 is 927724.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 427729 - 2¹ = 427727 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 427729.

It is not an unprimeable number, because it can be changed into a prime (427723) 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, 274 + ... + 964.

It is an arithmetic number, because the mean of its divisors is an integer number (107260).

2⁴²⁷⁷²⁹ is an apocalyptic number.

It is an amenable number.

427729 is a deficient number, since it is larger than the sum of its proper divisors (1311).

427729 is an equidigital number, since it uses as much as digits as its factorization.

427729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310.

The product of its digits is 7056, while the sum is 31.

The square root of 427729 is about 654.0099387624. The cubic root of 427729 is about 75.3453113976.

It can be divided in two parts, 427 and 729, that added together give a square (1156 = 34²).

The spelling of 427729 in words is "four hundred twenty-seven thousand, seven hundred twenty-nine".