1729423509 has 32 divisors (see below), whose sum is σ = 2556417024. Its totient is φ = 1031172480.

The previous prime is 1729423489. The next prime is 1729423511. The reversal of 1729423509 is 9053249271.

It is not a de Polignac number, because 1729423509 - 2²¹ = 1727326357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1729423589) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1413472 + ... + 1414694.

It is an arithmetic number, because the mean of its divisors is an integer number (79888032).

Almost surely, 2^1729423509 is an apocalyptic number.

It is an amenable number.

1729423509 is a deficient number, since it is larger than the sum of its proper divisors (826993515).

1729423509 is a wasteful number, since it uses less digits than its factorization.

1729423509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1897.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 1729423509 is about 41586.3380090145. The cubic root of 1729423509 is about 1200.3294255296.

The spelling of 1729423509 in words is "one billion, seven hundred twenty-nine million, four hundred twenty-three thousand, five hundred nine".