1840689 has 6 divisors (see below), whose sum is σ = 2658786. Its totient is φ = 1227120.

The previous prime is 1840679. The next prime is 1840697. The reversal of 1840689 is 9860481.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1440000 + 400689 = 1200^2 + 633^2 .

It is not a de Polignac number, because 1840689 - 2⁴ = 1840673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1840649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102252 + ... + 102269.

It is an arithmetic number, because the mean of its divisors is an integer number (443131).

2^1840689 is an apocalyptic number.

It is an amenable number.

1840689 is a deficient number, since it is larger than the sum of its proper divisors (818097).

1840689 is a wasteful number, since it uses less digits than its factorization.

1840689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204527 (or 204524 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1840689 is about 1356.7199416239. The cubic root of 1840689 is about 122.5538067110.

The spelling of 1840689 in words is "one million, eight hundred forty thousand, six hundred eighty-nine".