1138729 has 2 divisors, whose sum is σ = 1138730. Its totient is φ = 1138728.

The previous prime is 1138717. The next prime is 1138733. The reversal of 1138729 is 9278311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1123600 + 15129 = 1060^2 + 123^2 .

It is a cyclic number.

It is not a de Polignac number, because 1138729 - 2¹⁵ = 1105961 is a prime.

1138729 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1138729.

It is not a weakly prime, because it can be changed into another prime (1138429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569364 + 569365.

It is an arithmetic number, because the mean of its divisors is an integer number (569365).

2^1138729 is an apocalyptic number.

It is an amenable number.

1138729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138729 is an equidigital number, since it uses as much as digits as its factorization.

1138729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 1138729 is about 1067.1124589283. The cubic root of 1138729 is about 104.4255553672.

The spelling of 1138729 in words is "one million, one hundred thirty-eight thousand, seven hundred twenty-nine".