1983139 has 4 divisors (see below), whose sum is σ = 1992256. Its totient is φ = 1974024.

The previous prime is 1983109. The next prime is 1983143. The reversal of 1983139 is 9313891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9313891 = 823 ⋅11317.

It is a cyclic number.

It is not a de Polignac number, because 1983139 - 2⁹ = 1982627 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1983109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4224 + ... + 4669.

It is an arithmetic number, because the mean of its divisors is an integer number (498064).

2^1983139 is an apocalyptic number.

1983139 is a deficient number, since it is larger than the sum of its proper divisors (9117).

1983139 is an equidigital number, since it uses as much as digits as its factorization.

1983139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9116.

The product of its digits is 5832, while the sum is 34.

The square root of 1983139 is about 1408.2396813043. The cubic root of 1983139 is about 125.6370465251.

The spelling of 1983139 in words is "one million, nine hundred eighty-three thousand, one hundred thirty-nine".