1729989423 has 12 divisors (see below), whose sum is σ = 2499358680. Its totient is φ = 1153102416.

The previous prime is 1729989421. The next prime is 1729989439. The reversal of 1729989423 is 3249899271.

It is not a de Polignac number, because 1729989423 - 2¹ = 1729989421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1729989423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1729989421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39988 + ... + 71126.

It is an arithmetic number, because the mean of its divisors is an integer number (208279890).

Almost surely, 2^1729989423 is an apocalyptic number.

1729989423 is a deficient number, since it is larger than the sum of its proper divisors (769369257).

1729989423 is a wasteful number, since it uses less digits than its factorization.

1729989423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37318 (or 37315 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 1729989423 is about 41593.1415379988. The cubic root of 1729989423 is about 1200.4603379682.

The spelling of 1729989423 in words is "one billion, seven hundred twenty-nine million, nine hundred eighty-nine thousand, four hundred twenty-three".