1981683 has 24 divisors (see below), whose sum is σ = 3212976. Its totient is φ = 1166400.

The previous prime is 1981669. The next prime is 1981687. The reversal of 1981683 is 3861891.

It is not a de Polignac number, because 1981683 - 2⁴ = 1981667 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1981687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3393 + ... + 3933.

It is an arithmetic number, because the mean of its divisors is an integer number (133874).

2^1981683 is an apocalyptic number.

1981683 is a deficient number, since it is larger than the sum of its proper divisors (1231293).

1981683 is a wasteful number, since it uses less digits than its factorization.

1981683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595 (or 592 counting only the distinct ones).

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

The square root of 1981683 is about 1407.7226289294. The cubic root of 1981683 is about 125.6062918603.

It can be divided in two parts, 198 and 1683, that added together give a palindrome (1881).

The spelling of 1981683 in words is "one million, nine hundred eighty-one thousand, six hundred eighty-three".