1980901 has 4 divisors (see below), whose sum is σ = 2133292. Its totient is φ = 1828512.

The previous prime is 1980899. The next prime is 1980907. The reversal of 1980901 is 1090891.

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

It can be written as a sum of positive squares in 2 ways, for example, as 656100 + 1324801 = 810^2 + 1151^2 .

It is a cyclic number.

It is not a de Polignac number, because 1980901 - 2¹ = 1980899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1980901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76176 + ... + 76201.

It is an arithmetic number, because the mean of its divisors is an integer number (533323).

2^1980901 is an apocalyptic number.

It is an amenable number.

1980901 is a deficient number, since it is larger than the sum of its proper divisors (152391).

1980901 is a wasteful number, since it uses less digits than its factorization.

1980901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152390.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1980901 is about 1407.4448479425. Note that the first 3 decimals coincide. The cubic root of 1980901 is about 125.5897676831.

The spelling of 1980901 in words is "one million, nine hundred eighty thousand, nine hundred one".