1988856240 has 80 divisors (see below), whose sum is σ = 7046239488. Its totient is φ = 454595328.

The previous prime is 1988856223. The next prime is 1988856251. The reversal of 1988856240 is 426588891.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590242 + ... + 593601.

Almost surely, 2^1988856240 is an apocalyptic number.

1988856240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1988856240 is an abundant number, since it is smaller than the sum of its proper divisors (5057383248).

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

1988856240 is a wasteful number, since it uses less digits than its factorization.

1988856240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183866 (or 1183860 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 51.

The square root of 1988856240 is about 44596.5944888172. The cubic root of 1988856240 is about 1257.5766472785.

The spelling of 1988856240 in words is "one billion, nine hundred eighty-eight million, eight hundred fifty-six thousand, two hundred forty".