1988164988 has 12 divisors (see below), whose sum is σ = 3630562320. Its totient is φ = 950861472.

The previous prime is 1988164987. The next prime is 1988164999. The reversal of 1988164988 is 8894618891.

It is a self number, because there is not a number n which added to its sum of digits gives 1988164988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988164987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10805153 + ... + 10805336.

It is an arithmetic number, because the mean of its divisors is an integer number (302546860).

Almost surely, 2^1988164988 is an apocalyptic number.

It is an amenable number.

1988164988 is a deficient number, since it is larger than the sum of its proper divisors (1642397332).

1988164988 is a wasteful number, since it uses less digits than its factorization.

1988164988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21610516 (or 21610514 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 62.

The square root of 1988164988 is about 44588.8437616406. The cubic root of 1988164988 is about 1257.4309348691.

The spelling of 1988164988 in words is "one billion, nine hundred eighty-eight million, one hundred sixty-four thousand, nine hundred eighty-eight".