1728693401 has 2 divisors, whose sum is σ = 1728693402. Its totient is φ = 1728693400.

The previous prime is 1728693389. The next prime is 1728693427. The reversal of 1728693401 is 1043968271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1489960000 + 238733401 = 38600^2 + 15451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1728693401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1728693431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864346700 + 864346701.

It is an arithmetic number, because the mean of its divisors is an integer number (864346701).

Almost surely, 2^1728693401 is an apocalyptic number.

It is an amenable number.

1728693401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728693401 is an equidigital number, since it uses as much as digits as its factorization.

1728693401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1728693401 is about 41577.5588629251. The cubic root of 1728693401 is about 1200.1604880261.

The spelling of 1728693401 in words is "one billion, seven hundred twenty-eight million, six hundred ninety-three thousand, four hundred one".