1728257 has 2 divisors, whose sum is σ = 1728258. Its totient is φ = 1728256.

The previous prime is 1728253. The next prime is 1728269. The reversal of 1728257 is 7528271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1635841 + 92416 = 1279^2 + 304^2 .

It is a cyclic number.

It is not a de Polignac number, because 1728257 - 2² = 1728253 is a prime.

It is not a weakly prime, because it can be changed into another prime (1728253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864128 + 864129.

It is an arithmetic number, because the mean of its divisors is an integer number (864129).

2^1728257 is an apocalyptic number.

It is an amenable number.

1728257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728257 is an equidigital number, since it uses as much as digits as its factorization.

1728257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7840, while the sum is 32.

The square root of 1728257 is about 1314.6318876400. The cubic root of 1728257 is about 120.0059487792.

The spelling of 1728257 in words is "one million, seven hundred twenty-eight thousand, two hundred fifty-seven".