1983891 has 32 divisors (see below), whose sum is σ = 3351040. Its totient is φ = 1022112.

The previous prime is 1983889. The next prime is 1983913.

It is a happy number.

1983891 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1983891 - 2¹ = 1983889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an Ulam number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1983851) 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 31 ways as a sum of consecutive naturals, for example, 46116 + ... + 46158.

It is an arithmetic number, because the mean of its divisors is an integer number (104720).

2^1983891 is an apocalyptic number.

1983891 is a deficient number, since it is larger than the sum of its proper divisors (1367149).

1983891 is an equidigital number, since it uses as much as digits as its factorization.

1983891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 66 counting only the distinct ones).

The product of its digits is 15552, while the sum is 39.

The square root of 1983891 is about 1408.5066560013. The cubic root of 1983891 is about 125.6529249077.

The spelling of 1983891 in words is "one million, nine hundred eighty-three thousand, eight hundred ninety-one".