1681938 has 16 divisors (see below), whose sum is σ = 3737760. Its totient is φ = 560628.

The previous prime is 1681931. The next prime is 1681957. The reversal of 1681938 is 8391861.

It is not an unprimeable number, because it can be changed into a prime (1681931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15520 + ... + 15627.

It is an arithmetic number, because the mean of its divisors is an integer number (233610).

2^1681938 is an apocalyptic number.

1681938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1681938 is an abundant number, since it is smaller than the sum of its proper divisors (2055822).

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

1681938 is a wasteful number, since it uses less digits than its factorization.

1681938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31158 (or 31152 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1681938 is about 1296.8955239340. The cubic root of 1681938 is about 118.9241330796.

The spelling of 1681938 in words is "one million, six hundred eighty-one thousand, nine hundred thirty-eight".