1980811 has 4 divisors (see below), whose sum is σ = 2263792. Its totient is φ = 1697832.

The previous prime is 1980809. The next prime is 1980817. The reversal of 1980811 is 1180891.

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 1980811 - 2¹ = 1980809 is a prime.

It is a super-2 number, since 2×1980811² = 7847224435442, which contains 22 as substring.

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 1980811.

It is not an unprimeable number, because it can be changed into a prime (1980817) 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, 141480 + ... + 141493.

It is an arithmetic number, because the mean of its divisors is an integer number (565948).

2^1980811 is an apocalyptic number.

1980811 is a deficient number, since it is larger than the sum of its proper divisors (282981).

1980811 is an equidigital number, since it uses as much as digits as its factorization.

1980811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282980.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 1980811 is about 1407.4128747457. The cubic root of 1980811 is about 125.5878656445.

The spelling of 1980811 in words is "one million, nine hundred eighty thousand, eight hundred eleven".