1673786729 has 2 divisors, whose sum is σ = 1673786730. Its totient is φ = 1673786728.

The previous prime is 1673786717. The next prime is 1673786749. The reversal of 1673786729 is 9276873761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1572281104 + 101505625 = 39652^2 + 10075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1673786729 - 2¹⁶ = 1673721193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1673786749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836893364 + 836893365.

It is an arithmetic number, because the mean of its divisors is an integer number (836893365).

Almost surely, 2^1673786729 is an apocalyptic number.

It is an amenable number.

1673786729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1673786729 is an equidigital number, since it uses as much as digits as its factorization.

1673786729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5334336, while the sum is 56.

The square root of 1673786729 is about 40911.9387098681. The cubic root of 1673786729 is about 1187.3170564196.

The spelling of 1673786729 in words is "one billion, six hundred seventy-three million, seven hundred eighty-six thousand, seven hundred twenty-nine".