1993729 has 2 divisors, whose sum is σ = 1993730. Its totient is φ = 1993728.

The previous prime is 1993711. The next prime is 1993757. The reversal of 1993729 is 9273991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1385329 + 608400 = 1177^2 + 780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1993729 - 2⁵ = 1993697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1993691 and 1993700.

It is not a weakly prime, because it can be changed into another prime (1993759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996864 + 996865.

It is an arithmetic number, because the mean of its divisors is an integer number (996865).

2^1993729 is an apocalyptic number.

It is an amenable number.

1993729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1993729 is an equidigital number, since it uses as much as digits as its factorization.

1993729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 40.

The square root of 1993729 is about 1411.9946883753. The cubic root of 1993729 is about 125.8602843704.

The spelling of 1993729 in words is "one million, nine hundred ninety-three thousand, seven hundred twenty-nine".