1680637 has 16 divisors (see below), whose sum is σ = 2108160. Its totient is φ = 1306368.

The previous prime is 1680617. The next prime is 1680643. The reversal of 1680637 is 7360861.

It is not a de Polignac number, because 1680637 - 2⁷ = 1680509 is a prime.

It is a d-powerful number, because it can be written as 1 + 6³ + 8³ + 0 + 6⁸ + 3⁵ + 7² .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1680599 and 1680608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3208 + ... + 3694.

It is an arithmetic number, because the mean of its divisors is an integer number (131760).

2^1680637 is an apocalyptic number.

1680637 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1680637 is a deficient number, since it is larger than the sum of its proper divisors (427523).

1680637 is a wasteful number, since it uses less digits than its factorization.

1680637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 1680637 is about 1296.3938444778. The cubic root of 1680637 is about 118.8934620705.

The spelling of 1680637 in words is "one million, six hundred eighty thousand, six hundred thirty-seven".