1438729 has 2 divisors, whose sum is σ = 1438730. Its totient is φ = 1438728.

The previous prime is 1438721. The next prime is 1438747. The reversal of 1438729 is 9278341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1299600 + 139129 = 1140^2 + 373^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438729 - 2³ = 1438721 is a prime.

It is a super-2 number, since 2×1438729² = 4139882270882, which contains 22 as substring.

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 = 1438694 and 1438703.

It is not a weakly prime, because it can be changed into another prime (1438721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719364 + 719365.

It is an arithmetic number, because the mean of its divisors is an integer number (719365).

2^1438729 is an apocalyptic number.

It is an amenable number.

1438729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438729 is an equidigital number, since it uses as much as digits as its factorization.

1438729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 1438729 is about 1199.4702997574. The cubic root of 1438729 is about 112.8910898863.

The spelling of 1438729 in words is "one million, four hundred thirty-eight thousand, seven hundred twenty-nine".