1689904 has 10 divisors (see below), whose sum is σ = 3274220. Its totient is φ = 844944.

The previous prime is 1689893. The next prime is 1689907. The reversal of 1689904 is 4099861.

It is not an unprimeable number, because it can be changed into a prime (1689907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52794 + ... + 52825.

It is an arithmetic number, because the mean of its divisors is an integer number (327422).

2^1689904 is an apocalyptic number.

It is an amenable number.

1689904 is a deficient number, since it is larger than the sum of its proper divisors (1584316).

1689904 is a wasteful number, since it uses less digits than its factorization.

1689904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105627 (or 105621 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1689904 is about 1299.9630763987. The cubic root of 1689904 is about 119.1115870669. Note that the first 3 decimals are identical.

The spelling of 1689904 in words is "one million, six hundred eighty-nine thousand, nine hundred four".