1988508240 has 120 divisors (see below), whose sum is σ = 6968482560. Its totient is φ = 507209472.

The previous prime is 1988508233. The next prime is 1988508253. The reversal of 1988508240 is 428058891.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43480 + ... + 76599.

It is an arithmetic number, because the mean of its divisors is an integer number (58070688).

Almost surely, 2^1988508240 is an apocalyptic number.

1988508240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1988508240 is an abundant number, since it is smaller than the sum of its proper divisors (4979974320).

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

1988508240 is a wasteful number, since it uses less digits than its factorization.

1988508240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120121 (or 120112 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 1988508240 is about 44592.6926749215. The cubic root of 1988508240 is about 1257.5032948676.

The spelling of 1988508240 in words is "one billion, nine hundred eighty-eight million, five hundred eight thousand, two hundred forty".