2909505823 has 16 divisors (see below), whose sum is σ = 3445992000. Its totient is φ = 2403539712.

The previous prime is 2909505811. The next prime is 2909505847. The reversal of 2909505823 is 3285059092.

It is a happy number.

It is not a de Polignac number, because 2909505823 - 2⁹ = 2909505311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2909505823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2909505803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102913 + ... + 128101.

It is an arithmetic number, because the mean of its divisors is an integer number (215374500).

Almost surely, 2^2909505823 is an apocalyptic number.

2909505823 is a deficient number, since it is larger than the sum of its proper divisors (536486177).

2909505823 is a wasteful number, since it uses less digits than its factorization.

2909505823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25794.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 2909505823 is about 53939.8352148021. The cubic root of 2909505823 is about 1427.5995758058.

The spelling of 2909505823 in words is "two billion, nine hundred nine million, five hundred five thousand, eight hundred twenty-three".