1988649938 has 32 divisors (see below), whose sum is σ = 3365107200. Its totient is φ = 873216000.

The previous prime is 1988649931. The next prime is 1988649977. The reversal of 1988649938 is 8399468891.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1988649931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 434888 + ... + 439436.

It is an arithmetic number, because the mean of its divisors is an integer number (105159600).

Almost surely, 2^1988649938 is an apocalyptic number.

1988649938 is a deficient number, since it is larger than the sum of its proper divisors (1376457262).

1988649938 is a wasteful number, since it uses less digits than its factorization.

1988649938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5234.

The product of its digits is 26873856, while the sum is 65.

The square root of 1988649938 is about 44594.2814495312. The cubic root of 1988649938 is about 1257.5331634002.

It can be divided in two parts, 198864 and 9938, that added together give a palindrome (208802).

The spelling of 1988649938 in words is "one billion, nine hundred eighty-eight million, six hundred forty-nine thousand, nine hundred thirty-eight".