1980039 has 4 divisors (see below), whose sum is σ = 2640056. Its totient is φ = 1320024.

The previous prime is 1980031. The next prime is 1980053. The reversal of 1980039 is 9300891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1980039 - 2³ = 1980031 is a prime.

It is a D-number.

It is a Duffinian number.

1980039 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1979988 and 1980015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980031) 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, 330004 + ... + 330009.

It is an arithmetic number, because the mean of its divisors is an integer number (660014).

2^1980039 is an apocalyptic number.

1980039 is a deficient number, since it is larger than the sum of its proper divisors (660017).

1980039 is an equidigital number, since it uses as much as digits as its factorization.

1980039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660016.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1980039 is about 1407.1385859254. The cubic root of 1980039 is about 125.5715480132.

The spelling of 1980039 in words is "one million, nine hundred eighty thousand, thirty-nine".