1980002 has 4 divisors (see below), whose sum is σ = 2970006. Its totient is φ = 990000.

The previous prime is 1979993. The next prime is 1980019. The reversal of 1980002 is 2000891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2000891 = 113 ⋅17707.

It can be written as a sum of positive squares in only one way, i.e., 1957201 + 22801 = 1399^2 + 151^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 494999 + ... + 495002.

2^1980002 is an apocalyptic number.

1980002 is a deficient number, since it is larger than the sum of its proper divisors (990004).

1980002 is an equidigital number, since it uses as much as digits as its factorization.

1980002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990003.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1980002 is about 1407.1254386159. The cubic root of 1980002 is about 125.5707658441.

Adding to 1980002 its reverse (2000891), we get a palindrome (3980893).

The spelling of 1980002 in words is "one million, nine hundred eighty thousand, two".