1980321 has 16 divisors (see below), whose sum is σ = 3040128. Its totient is φ = 1123200.

The previous prime is 1980317. The next prime is 1980337. The reversal of 1980321 is 1230891.

It is not a de Polignac number, because 1980321 - 2² = 1980317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1980291 and 1980300.

It is not an unprimeable number, because it can be changed into a prime (1980301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3541 + ... + 4061.

It is an arithmetic number, because the mean of its divisors is an integer number (190008).

2^1980321 is an apocalyptic number.

It is an amenable number.

1980321 is a deficient number, since it is larger than the sum of its proper divisors (1059807).

1980321 is a wasteful number, since it uses less digits than its factorization.

1980321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1980321 is about 1407.2387857077. The cubic root of 1980321 is about 125.5775090903.

The spelling of 1980321 in words is "one million, nine hundred eighty thousand, three hundred twenty-one".