2009391800 has 48 divisors (see below), whose sum is σ = 5031214440. Its totient is φ = 741928320.

The previous prime is 2009391779. The next prime is 2009391829. The reversal of 2009391800 is 81939002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 383822 + ... + 389021.

Almost surely, 2^2009391800 is an apocalyptic number.

2009391800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2009391800 is an abundant number, since it is smaller than the sum of its proper divisors (3021822640).

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

2009391800 is a wasteful number, since it uses less digits than its factorization.

2009391800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772872 (or 772863 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 2009391800 is about 44826.2400832370. The cubic root of 2009391800 is about 1261.8901253293.

The spelling of 2009391800 in words is "two billion, nine million, three hundred ninety-one thousand, eight hundred".