1438689 has 12 divisors (see below), whose sum is σ = 2231664. Its totient is φ = 822024.

The previous prime is 1438687. The next prime is 1438709. The reversal of 1438689 is 9868341.

1438689 = T₁₂₀ + T₁₂₁ + ... + T₂₁₇.

It is not a de Polignac number, because 1438689 - 2¹ = 1438687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1438681) 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 in 11 ways as a sum of consecutive naturals, for example, 4747 + ... + 5040.

It is an arithmetic number, because the mean of its divisors is an integer number (185972).

2^1438689 is an apocalyptic number.

It is an amenable number.

1438689 is a deficient number, since it is larger than the sum of its proper divisors (792975).

1438689 is an equidigital number, since it uses as much as digits as its factorization.

1438689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9804 (or 9797 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 1438689 is about 1199.4536256146. The cubic root of 1438689 is about 112.8900436653.

The spelling of 1438689 in words is "one million, four hundred thirty-eight thousand, six hundred eighty-nine".