1238729 has 6 divisors (see below), whose sum is σ = 1280970. Its totient is φ = 1197840.

The previous prime is 1238719. The next prime is 1238747. The reversal of 1238729 is 9278321.

It can be written as a sum of positive squares in only one way, i.e., 1177225 + 61504 = 1085^2 + 248^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1238729 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1238695 and 1238704.

It is not an unprimeable number, because it can be changed into a prime (1238719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 317 + ... + 1605.

It is an arithmetic number, because the mean of its divisors is an integer number (213495).

2^1238729 is an apocalyptic number.

It is an amenable number.

1238729 is a deficient number, since it is larger than the sum of its proper divisors (42241).

1238729 is an equidigital number, since it uses as much as digits as its factorization.

1238729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351 (or 1320 counting only the distinct ones).

The product of its digits is 6048, while the sum is 32.

The square root of 1238729 is about 1112.9820304030. The cubic root of 1238729 is about 107.3969880338.

The spelling of 1238729 in words is "one million, two hundred thirty-eight thousand, seven hundred twenty-nine".