1689942 has 16 divisors (see below), whose sum is σ = 3428352. Its totient is φ = 555240.

The previous prime is 1689931. The next prime is 1689967. The reversal of 1689942 is 2499861.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 1689942.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1558 + ... + 2409.

It is an arithmetic number, because the mean of its divisors is an integer number (214272).

2^1689942 is an apocalyptic number.

1689942 is an abundant number, since it is smaller than the sum of its proper divisors (1738410).

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

1689942 is a wasteful number, since it uses less digits than its factorization.

1689942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4043.

The product of its digits is 31104, while the sum is 39.

The square root of 1689942 is about 1299.9776921163. The cubic root of 1689942 is about 119.1124798605.

The spelling of 1689942 in words is "one million, six hundred eighty-nine thousand, nine hundred forty-two".