1980223918 has 4 divisors (see below), whose sum is σ = 2970335880. Its totient is φ = 990111958.

The previous prime is 1980223901. The next prime is 1980223951. The reversal of 1980223918 is 8193220891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8193220891 = 151 ⋅54259741.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495055978 + ... + 495055981.

It is an arithmetic number, because the mean of its divisors is an integer number (742583970).

Almost surely, 2^1980223918 is an apocalyptic number.

1980223918 is a deficient number, since it is larger than the sum of its proper divisors (990111962).

1980223918 is an equidigital number, since it uses as much as digits as its factorization.

1980223918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990111961.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 1980223918 is about 44499.7069428553. The cubic root of 1980223918 is about 1255.7545697944.

The spelling of 1980223918 in words is "one billion, nine hundred eighty million, two hundred twenty-three thousand, nine hundred eighteen".