1988672918 has 4 divisors (see below), whose sum is σ = 2983009380. Its totient is φ = 994336458.

The previous prime is 1988672911. The next prime is 1988672921. The reversal of 1988672918 is 8192768891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8192768891 = 277 ⋅29576783.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988672911) by changing a digit.

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, 497168228 + ... + 497168231.

It is an arithmetic number, because the mean of its divisors is an integer number (745752345).

Almost surely, 2^1988672918 is an apocalyptic number.

1988672918 is a deficient number, since it is larger than the sum of its proper divisors (994336462).

1988672918 is an equidigital number, since it uses as much as digits as its factorization.

1988672918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994336461.

The product of its digits is 3483648, while the sum is 59.

The square root of 1988672918 is about 44594.5391051416. The cubic root of 1988672918 is about 1257.5380072225.

The spelling of 1988672918 in words is "one billion, nine hundred eighty-eight million, six hundred seventy-two thousand, nine hundred eighteen".