1988540983 has 24 divisors (see below), whose sum is σ = 2492383824. Its totient is φ = 1570525440.

The previous prime is 1988540971. The next prime is 1988540989. The reversal of 1988540983 is 3890458891.

It is a de Polignac number, because none of the positive numbers 2^k-1988540983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988540989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10441 + ... + 63922.

It is an arithmetic number, because the mean of its divisors is an integer number (103849326).

Almost surely, 2^1988540983 is an apocalyptic number.

1988540983 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1988540983 is a deficient number, since it is larger than the sum of its proper divisors (503842841).

1988540983 is a wasteful number, since it uses less digits than its factorization.

1988540983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74415 (or 74404 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 55.

The square root of 1988540983 is about 44593.0598075530. The cubic root of 1988540983 is about 1257.5101968932.

The spelling of 1988540983 in words is "one billion, nine hundred eighty-eight million, five hundred forty thousand, nine hundred eighty-three".