2909919820 has 24 divisors (see below), whose sum is σ = 6116635728. Its totient is φ = 1162862400.

The previous prime is 2909919799. The next prime is 2909919821. The reversal of 2909919820 is 289199092.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2909919821) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 47346 + ... + 89785.

It is an arithmetic number, because the mean of its divisors is an integer number (254859822).

Almost surely, 2^2909919820 is an apocalyptic number.

2909919820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2909919820 is an abundant number, since it is smaller than the sum of its proper divisors (3206715908).

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

2909919820 is a wasteful number, since it uses less digits than its factorization.

2909919820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138201 (or 138199 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 2909919820 is about 53943.6726595437. The cubic root of 2909919820 is about 1427.6672842011.

The spelling of 2909919820 in words is "two billion, nine hundred nine million, nine hundred nineteen thousand, eight hundred twenty".