1980403 has 4 divisors (see below), whose sum is σ = 2008368. Its totient is φ = 1952440.

The previous prime is 1980401. The next prime is 1980409. The reversal of 1980403 is 3040891.

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

It is a cyclic number.

It is not a de Polignac number, because 1980403 - 2¹ = 1980401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1980401) 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, 13876 + ... + 14017.

It is an arithmetic number, because the mean of its divisors is an integer number (502092).

2^1980403 is an apocalyptic number.

1980403 is a deficient number, since it is larger than the sum of its proper divisors (27965).

1980403 is an equidigital number, since it uses as much as digits as its factorization.

1980403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27964.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1980403 is about 1407.2679204757. The cubic root of 1980403 is about 125.5792423470.

The spelling of 1980403 in words is "one million, nine hundred eighty thousand, four hundred three".