2001219990 has 64 divisors (see below), whose sum is σ = 5988072960. Its totient is φ = 415837440.

The previous prime is 2001219967. The next prime is 2001220007. The reversal of 2001219990 is 999121002.

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

It is a Curzon number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 430855 + ... + 435474.

It is an arithmetic number, because the mean of its divisors is an integer number (93563640).

Almost surely, 2^2001219990 is an apocalyptic number.

2001219990 is an abundant number, since it is smaller than the sum of its proper divisors (3986852970).

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

2001219990 is a wasteful number, since it uses less digits than its factorization.

2001219990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866357.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 2001219990 is about 44734.9973734212. The cubic root of 2001219990 is about 1260.1771796696.

The spelling of 2001219990 in words is "two billion, one million, two hundred nineteen thousand, nine hundred ninety".