1728370397 has 32 divisors (see below), whose sum is σ = 2053201920. Its totient is φ = 1439570880.

The previous prime is 1728370393. The next prime is 1728370403. The reversal of 1728370397 is 7930738271.

It is a cyclic number.

It is not a de Polignac number, because 1728370397 - 2² = 1728370393 is a prime.

It is a super-3 number, since 3×1728370397³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728370393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1743572 + ... + 1744562.

It is an arithmetic number, because the mean of its divisors is an integer number (64162560).

Almost surely, 2^1728370397 is an apocalyptic number.

It is an amenable number.

1728370397 is a deficient number, since it is larger than the sum of its proper divisors (324831523).

1728370397 is a wasteful number, since it uses less digits than its factorization.

1728370397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353.

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 1728370397 is about 41573.6743264292. The cubic root of 1728370397 is about 1200.0857339209.

The spelling of 1728370397 in words is "one billion, seven hundred twenty-eight million, three hundred seventy thousand, three hundred ninety-seven".