1683881 has 4 divisors (see below), whose sum is σ = 1686672. Its totient is φ = 1681092.

The previous prime is 1683841. The next prime is 1683887. The reversal of 1683881 is 1883861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1683881 - 2⁶ = 1683817 is a prime.

It is a super-2 number, since 2×1683881² = 5670910444322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1683887) 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 3 ways as a sum of consecutive naturals, for example, 71 + ... + 1836.

It is an arithmetic number, because the mean of its divisors is an integer number (421668).

2^1683881 is an apocalyptic number.

It is an amenable number.

1683881 is a deficient number, since it is larger than the sum of its proper divisors (2791).

1683881 is an equidigital number, since it uses as much as digits as its factorization.

1683881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790.

The product of its digits is 9216, while the sum is 35.

The square root of 1683881 is about 1297.6444042957. The cubic root of 1683881 is about 118.9699097708.

The spelling of 1683881 in words is "one million, six hundred eighty-three thousand, eight hundred eighty-one".