1988621996 has 6 divisors (see below), whose sum is σ = 3480088500. Its totient is φ = 994310996.

The previous prime is 1988621951. The next prime is 1988622019. The reversal of 1988621996 is 6991268891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248577746 + ... + 248577753.

It is an arithmetic number, because the mean of its divisors is an integer number (580014750).

Almost surely, 2^1988621996 is an apocalyptic number.

It is an amenable number.

1988621996 is a deficient number, since it is larger than the sum of its proper divisors (1491466504).

1988621996 is a wasteful number, since it uses less digits than its factorization.

1988621996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497155503 (or 497155501 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 59.

The square root of 1988621996 is about 44593.9681571398. The cubic root of 1988621996 is about 1257.5272736161.

The spelling of 1988621996 in words is "one billion, nine hundred eighty-eight million, six hundred twenty-one thousand, nine hundred ninety-six".