1988113940 has 48 divisors (see below), whose sum is σ = 4269246912. Its totient is φ = 777501696.

The previous prime is 1988113913. The next prime is 1988113949. The reversal of 1988113940 is 493118891.

It is a junction number, because it is equal to n+sod(n) for n = 1988113891 and 1988113900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988113949) 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, 154847 + ... + 167193.

It is an arithmetic number, because the mean of its divisors is an integer number (88942644).

Almost surely, 2^1988113940 is an apocalyptic number.

1988113940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1988113940 is an abundant number, since it is smaller than the sum of its proper divisors (2281132972).

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

1988113940 is a wasteful number, since it uses less digits than its factorization.

With its successor (1988113941) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (12534).

With its successor (1988113941) it forms an eRAP, since the sums of their prime factors are consecutive (12536 and 12537).

1988113940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12536 (or 12534 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 1988113940 is about 44588.2713277830. The cubic root of 1988113940 is about 1257.4201728709.

The spelling of 1988113940 in words is "one billion, nine hundred eighty-eight million, one hundred thirteen thousand, nine hundred forty".