1980001 has 8 divisors (see below), whose sum is σ = 2133504. Its totient is φ = 1832160.

The previous prime is 1979993. The next prime is 1980019. The reversal of 1980001 is 1000891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1980001 - 2³ = 1979993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1980031) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 676 + ... + 2101.

It is an arithmetic number, because the mean of its divisors is an integer number (266688).

2^1980001 is an apocalyptic number.

It is an amenable number.

1980001 is a deficient number, since it is larger than the sum of its proper divisors (153503).

1980001 is a wasteful number, since it uses less digits than its factorization.

1980001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1980001 is about 1407.1250832815. The cubic root of 1980001 is about 125.5707447042.

Adding to 1980001 its reverse (1000891), we get a palindrome (2980892).

The spelling of 1980001 in words is "one million, nine hundred eighty thousand, one".