1255729 has 16 divisors (see below), whose sum is σ = 1425600. Its totient is φ = 1100736.

The previous prime is 1255721. The next prime is 1255747. The reversal of 1255729 is 9275521.

It is a cyclic number.

It is not a de Polignac number, because 1255729 - 2³ = 1255721 is a prime.

It is a Duffinian number.

1255729 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1255729.

It is not an unprimeable number, because it can be changed into a prime (1255721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23667 + ... + 23719.

It is an arithmetic number, because the mean of its divisors is an integer number (89100).

2^1255729 is an apocalyptic number.

1255729 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1255729 is a deficient number, since it is larger than the sum of its proper divisors (169871).

1255729 is a wasteful number, since it uses less digits than its factorization.

1255729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144.

The product of its digits is 6300, while the sum is 31.

The square root of 1255729 is about 1120.5931465077. The cubic root of 1255729 is about 107.8860538051.

The spelling of 1255729 in words is "one million, two hundred fifty-five thousand, seven hundred twenty-nine".