1988853840 has 60 divisors (see below), whose sum is σ = 6679236564. Its totient is φ = 530360832.

The previous prime is 1988853827. The next prime is 1988853857. The reversal of 1988853840 is 483588891.

It can be written as a sum of positive squares in 2 ways, for example, as 648415296 + 1340438544 = 25464^2 + 36612^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1380429 + ... + 1381868.

Almost surely, 2^1988853840 is an apocalyptic number.

1988853840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1988853840 is an abundant number, since it is smaller than the sum of its proper divisors (4690382724).

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

1988853840 is a wasteful number, since it uses less digits than its factorization.

1988853840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2762316 (or 2762307 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 54.

The square root of 1988853840 is about 44596.5675809249. The cubic root of 1988853840 is about 1257.5761414292.

The spelling of 1988853840 in words is "one billion, nine hundred eighty-eight million, eight hundred fifty-three thousand, eight hundred forty".