1728730931 has 2 divisors, whose sum is σ = 1728730932. Its totient is φ = 1728730930.

The previous prime is 1728730859. The next prime is 1728730957. The reversal of 1728730931 is 1390378271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1728730931 - 2¹⁰ = 1728729907 is a prime.

It is a super-2 number, since 2×1728730931² = 5977021263592253522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1728730981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864365465 + 864365466.

It is an arithmetic number, because the mean of its divisors is an integer number (864365466).

Almost surely, 2^1728730931 is an apocalyptic number.

1728730931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728730931 is an equidigital number, since it uses as much as digits as its factorization.

1728730931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 1728730931 is about 41578.0101856739. The cubic root of 1728730931 is about 1200.1691731400.

The spelling of 1728730931 in words is "one billion, seven hundred twenty-eight million, seven hundred thirty thousand, nine hundred thirty-one".