1636729 has 2 divisors, whose sum is σ = 1636730. Its totient is φ = 1636728.

The previous prime is 1636721. The next prime is 1636741. The reversal of 1636729 is 9276361.

1636729 is nontrivially palindromic in base 5.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1071225 + 565504 = 1035^2 + 752^2 .

It is a cyclic number.

It is not a de Polignac number, because 1636729 - 2³ = 1636721 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1636694 and 1636703.

It is not a weakly prime, because it can be changed into another prime (1636721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 818364 + 818365.

It is an arithmetic number, because the mean of its divisors is an integer number (818365).

2^1636729 is an apocalyptic number.

It is an amenable number.

1636729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1636729 is an equidigital number, since it uses as much as digits as its factorization.

1636729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 34.

The square root of 1636729 is about 1279.3470991095. The cubic root of 1636729 is about 117.8489160902.

The spelling of 1636729 in words is "one million, six hundred thirty-six thousand, seven hundred twenty-nine".