1989239240 has 16 divisors (see below), whose sum is σ = 4475788380. Its totient is φ = 795695680.

The previous prime is 1989239117. The next prime is 1989239281. The reversal of 1989239240 is 429329891.

It can be written as a sum of positive squares in 2 ways, for example, as 1822777636 + 166461604 = 42694^2 + 12902^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24865451 + ... + 24865530.

Almost surely, 2^1989239240 is an apocalyptic number.

1989239240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1989239240 is an abundant number, since it is smaller than the sum of its proper divisors (2486549140).

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

1989239240 is a wasteful number, since it uses less digits than its factorization.

1989239240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49730992 (or 49730988 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1989239240 is about 44600.8883319604. Note that the first 3 decimals coincide. The cubic root of 1989239240 is about 1257.6573671972.

The spelling of 1989239240 in words is "one billion, nine hundred eighty-nine million, two hundred thirty-nine thousand, two hundred forty".