1728739697 has 2 divisors, whose sum is σ = 1728739698. Its totient is φ = 1728739696.

The previous prime is 1728739693. The next prime is 1728739711. The reversal of 1728739697 is 7969378271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1369296016 + 359443681 = 37004^2 + 18959^2 .

It is a cyclic number.

It is not a de Polignac number, because 1728739697 - 2² = 1728739693 is a prime.

It is not a weakly prime, because it can be changed into another prime (1728739693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864369848 + 864369849.

It is an arithmetic number, because the mean of its divisors is an integer number (864369849).

Almost surely, 2^1728739697 is an apocalyptic number.

It is an amenable number.

1728739697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728739697 is an equidigital number, since it uses as much as digits as its factorization.

1728739697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8001504, while the sum is 59.

The square root of 1728739697 is about 41578.1156018404. The cubic root of 1728739697 is about 1200.1712017312.

The spelling of 1728739697 in words is "one billion, seven hundred twenty-eight million, seven hundred thirty-nine thousand, six hundred ninety-seven".