2001999990 has 16 divisors (see below), whose sum is σ = 4804800048. Its totient is φ = 533866656.

The previous prime is 2001999953. The next prime is 2001999997. The reversal of 2001999990 is 999991002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001999997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33366637 + ... + 33366696.

It is an arithmetic number, because the mean of its divisors is an integer number (300300003).

Almost surely, 2^2001999990 is an apocalyptic number.

2001999990 is an abundant number, since it is smaller than the sum of its proper divisors (2802800058).

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

2001999990 is a wasteful number, since it uses less digits than its factorization.

2001999990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66733343.

The product of its (nonzero) digits is 118098, while the sum is 48.

The square root of 2001999990 is about 44743.7145306466. The cubic root of 2001999990 is about 1260.3408815662.

The spelling of 2001999990 in words is "two billion, one million, nine hundred ninety-nine thousand, nine hundred ninety".