1689290 has 32 divisors (see below), whose sum is σ = 3395520. Its totient is φ = 601344.

The previous prime is 1689287. The next prime is 1689319. The reversal of 1689290 is 929861.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1689290.

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 15 ways as a sum of consecutive naturals, for example, 2969 + ... + 3491.

It is an arithmetic number, because the mean of its divisors is an integer number (106110).

2^1689290 is an apocalyptic number.

1689290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1689290 is an abundant number, since it is smaller than the sum of its proper divisors (1706230).

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

1689290 is a wasteful number, since it uses less digits than its factorization.

1689290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 1689290 is about 1299.7268943897. The cubic root of 1689290 is about 119.0971595464.

The spelling of 1689290 in words is "one million, six hundred eighty-nine thousand, two hundred ninety".