201989988 has 144 divisors (see below), whose sum is σ = 589680000. Its totient is φ = 57867264.

The previous prime is 201989929. The next prime is 201990011. The reversal of 201989988 is 889989102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 336913 + ... + 337511.

It is an arithmetic number, because the mean of its divisors is an integer number (4095000).

Almost surely, 2^201989988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201989988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294840000).

201989988 is an abundant number, since it is smaller than the sum of its proper divisors (387690012).

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

201989988 is a wasteful number, since it uses less digits than its factorization.

201989988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 54.

The square root of 201989988 is about 14212.3181782565. The cubic root of 201989988 is about 586.7367367810.

The spelling of 201989988 in words is "two hundred one million, nine hundred eighty-nine thousand, nine hundred eighty-eight".