1672747729 has 2 divisors, whose sum is σ = 1672747730. Its totient is φ = 1672747728.

The previous prime is 1672747711. The next prime is 1672747733. The reversal of 1672747729 is 9277472761.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1525683600 + 147064129 = 39060^2 + 12127^2 .

It is a cyclic number.

It is not a de Polignac number, because 1672747729 - 2⁵ = 1672747697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1672747709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836373864 + 836373865.

It is an arithmetic number, because the mean of its divisors is an integer number (836373865).

Almost surely, 2^1672747729 is an apocalyptic number.

It is an amenable number.

1672747729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1672747729 is an equidigital number, since it uses as much as digits as its factorization.

1672747729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2074464, while the sum is 52.

The square root of 1672747729 is about 40899.2387337466. The cubic root of 1672747729 is about 1187.0713306162.

The spelling of 1672747729 in words is "one billion, six hundred seventy-two million, seven hundred forty-seven thousand, seven hundred twenty-nine".