1728706399 has 8 divisors (see below), whose sum is σ = 1976107680. Its totient is φ = 1481415936.

The previous prime is 1728706379. The next prime is 1728706409. The reversal of 1728706399 is 9936078271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1728706399 - 2¹⁵ = 1728673631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728706379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8967 + ... + 59479.

It is an arithmetic number, because the mean of its divisors is an integer number (247013460).

Almost surely, 2^1728706399 is an apocalyptic number.

1728706399 is a deficient number, since it is larger than the sum of its proper divisors (247401281).

1728706399 is an equidigital number, since it uses as much as digits as its factorization.

1728706399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55409.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The square root of 1728706399 is about 41577.7151729144. The cubic root of 1728706399 is about 1200.1634960102.

The spelling of 1728706399 in words is "one billion, seven hundred twenty-eight million, seven hundred six thousand, three hundred ninety-nine".