1689438 has 24 divisors (see below), whose sum is σ = 3503304. Its totient is φ = 543120.

The previous prime is 1689437. The next prime is 1689451. The reversal of 1689438 is 8349861.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1689396 and 1689405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689431) 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, 5620 + ... + 5912.

It is an arithmetic number, because the mean of its divisors is an integer number (145971).

2^1689438 is an apocalyptic number.

1689438 is an abundant number, since it is smaller than the sum of its proper divisors (1813866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1689438 is a wasteful number, since it uses less digits than its factorization.

1689438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 329 counting only the distinct ones).

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

The square root of 1689438 is about 1299.7838281807. The cubic root of 1689438 is about 119.1006375095.

The spelling of 1689438 in words is "one million, six hundred eighty-nine thousand, four hundred thirty-eight".