1680138 has 24 divisors (see below), whose sum is σ = 3758976. Its totient is φ = 541800.

The previous prime is 1680131. The next prime is 1680149. The reversal of 1680138 is 8310861.

It is not an unprimeable number, because it can be changed into a prime (1680131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 948 + ... + 2063.

It is an arithmetic number, because the mean of its divisors is an integer number (156624).

2^1680138 is an apocalyptic number.

1680138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1680138 is an abundant number, since it is smaller than the sum of its proper divisors (2078838).

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

1680138 is a wasteful number, since it uses less digits than its factorization.

1680138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3050 (or 3047 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1680138 is about 1296.2013732441. The cubic root of 1680138 is about 118.8816939710.

Adding to 1680138 its reverse (8310861), we get a palindrome (9990999).

The spelling of 1680138 in words is "one million, six hundred eighty thousand, one hundred thirty-eight".