1988839440 has 960 divisors, whose sum is σ = 8956569600. Its totient is φ = 402361344.

The previous prime is 1988839409. The next prime is 1988839453. The reversal of 1988839440 is 449388891.

1988839440 is a `hidden beast` number, since 1 + 98 + 88 + 39 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 46252059 + ... + 46252101.

It is an arithmetic number, because the mean of its divisors is an integer number (9329760).

Almost surely, 2^1988839440 is an apocalyptic number.

1988839440 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 1988839440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4478284800).

1988839440 is an abundant number, since it is smaller than the sum of its proper divisors (6967730160).

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

1988839440 is a wasteful number, since it uses less digits than its factorization.

1988839440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The square root of 1988839440 is about 44596.4061332301. The cubic root of 1988839440 is about 1257.5731063242.

The spelling of 1988839440 in words is "one billion, nine hundred eighty-eight million, eight hundred thirty-nine thousand, four hundred forty".