1988259840 has 624 divisors, whose sum is σ = 8341452288. Its totient is φ = 428212224.

The previous prime is 1988259829. The next prime is 1988259859. The reversal of 1988259840 is 489528891.

1988259840 is a `hidden beast` number, since 1 + 9 + 8 + 8 + 2 + 598 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29675487 + ... + 29675553.

It is an arithmetic number, because the mean of its divisors is an integer number (13367712).

Almost surely, 2^1988259840 is an apocalyptic number.

1988259840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1988259840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4170726144).

1988259840 is an abundant number, since it is smaller than the sum of its proper divisors (6353192448).

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

1988259840 is a wasteful number, since it uses less digits than its factorization.

1988259840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The square root of 1988259840 is about 44589.9073782398. The cubic root of 1988259840 is about 1257.4509311878.

The spelling of 1988259840 in words is "one billion, nine hundred eighty-eight million, two hundred fifty-nine thousand, eight hundred forty".