1980518 has 4 divisors (see below), whose sum is σ = 2970780. Its totient is φ = 990258.

The previous prime is 1980491. The next prime is 1980521. The reversal of 1980518 is 8150891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8150891 = 7 ⋅1164413.

It is a congruent number.

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, 495128 + ... + 495131.

It is an arithmetic number, because the mean of its divisors is an integer number (742695).

2^1980518 is an apocalyptic number.

1980518 is a deficient number, since it is larger than the sum of its proper divisors (990262).

1980518 is an equidigital number, since it uses as much as digits as its factorization.

1980518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990261.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 1980518 is about 1407.3087791952. The cubic root of 1980518 is about 125.5816730532.

The spelling of 1980518 in words is "one million, nine hundred eighty thousand, five hundred eighteen".