1988000538 has 32 divisors (see below), whose sum is σ = 4250074752. Its totient is φ = 618393600.

The previous prime is 1988000537. The next prime is 1988000543. The reversal of 1988000538 is 8350008891.

It is a super-2 number, since 2×1988000538² = 7904292278176578888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1988000538.

It is not an unprimeable number, because it can be changed into a prime (1988000537) 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, 170023 + ... + 181338.

It is an arithmetic number, because the mean of its divisors is an integer number (132814836).

Almost surely, 2^1988000538 is an apocalyptic number.

1988000538 is an abundant number, since it is smaller than the sum of its proper divisors (2262074214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1988000538 is a wasteful number, since it uses less digits than its factorization.

1988000538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351430.

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 1988000538 is about 44586.9996523650. Note that the first 3 decimals coincide. The cubic root of 1988000538 is about 1257.3962646715.

The spelling of 1988000538 in words is "one billion, nine hundred eighty-eight million, five hundred thirty-eight", and thus it is an aban number.