1980847 has 4 divisors (see below), whose sum is σ = 2160936. Its totient is φ = 1800760.

The previous prime is 1980821. The next prime is 1980859. The reversal of 1980847 is 7480891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7480891 = 11 ⋅680081.

It is a cyclic number.

It is not a de Polignac number, because 1980847 - 2¹¹ = 1978799 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

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, 90028 + ... + 90049.

It is an arithmetic number, because the mean of its divisors is an integer number (540234).

2^1980847 is an apocalyptic number.

1980847 is a deficient number, since it is larger than the sum of its proper divisors (180089).

1980847 is a wasteful number, since it uses less digits than its factorization.

1980847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180088.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 1980847 is about 1407.4256641116. The cubic root of 1980847 is about 125.5886264668.

The spelling of 1980847 in words is "one million, nine hundred eighty thousand, eight hundred forty-seven".