1680849 has 6 divisors (see below), whose sum is σ = 2427906. Its totient is φ = 1120560.

The previous prime is 1680839. The next prime is 1680859. The reversal of 1680849 is 9480861.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1680839) and next prime (1680859).

It can be written as a sum of positive squares in only one way, i.e., 1140624 + 540225 = 1068^2 + 735^2 .

It is not a de Polignac number, because 1680849 - 2⁸ = 1680593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1680839) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 93372 + ... + 93389.

It is an arithmetic number, because the mean of its divisors is an integer number (404651).

2^1680849 is an apocalyptic number.

It is an amenable number.

1680849 is a deficient number, since it is larger than the sum of its proper divisors (747057).

1680849 is a wasteful number, since it uses less digits than its factorization.

1680849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186767 (or 186764 counting only the distinct ones).

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

The square root of 1680849 is about 1296.4756071751. The cubic root of 1680849 is about 118.8984610390.

The spelling of 1680849 in words is "one million, six hundred eighty thousand, eight hundred forty-nine".