1728947401 has 2 divisors, whose sum is σ = 1728947402. Its totient is φ = 1728947400.

The previous prime is 1728947399. The next prime is 1728947431. The reversal of 1728947401 is 1047498271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1570061376 + 158886025 = 39624^2 + 12605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1728947401 - 2¹ = 1728947399 is a prime.

It is a super-3 number, since 3×1728947401³ (a number of 29 digits) contains 333 as substring.

Together with 1728947399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1728947431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864473700 + 864473701.

It is an arithmetic number, because the mean of its divisors is an integer number (864473701).

Almost surely, 2^1728947401 is an apocalyptic number.

It is an amenable number.

1728947401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728947401 is an equidigital number, since it uses as much as digits as its factorization.

1728947401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 1728947401 is about 41580.6132831155. The cubic root of 1728947401 is about 1200.2192657201.

The spelling of 1728947401 in words is "one billion, seven hundred twenty-eight million, nine hundred forty-seven thousand, four hundred one".