2001229890 has 96 divisors (see below), whose sum is σ = 5402472768. Its totient is φ = 473827200.

The previous prime is 2001229889. The next prime is 2001229897. The reversal of 2001229890 is 989221002.

It is a happy number.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (2001229897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 149680 + ... + 162500.

It is an arithmetic number, because the mean of its divisors is an integer number (56275758).

Almost surely, 2^2001229890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001229890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2701236384).

2001229890 is an abundant number, since it is smaller than the sum of its proper divisors (3401242878).

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

2001229890 is a wasteful number, since it uses less digits than its factorization.

2001229890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12896 (or 12885 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 2001229890 is about 44735.1080249059. The cubic root of 2001229890 is about 1260.1792576909.

It can be divided in two parts, 200122 and 9890, that added together give a palindrome (210012).

The spelling of 2001229890 in words is "two billion, one million, two hundred twenty-nine thousand, eight hundred ninety".