2949209865 has 32 divisors (see below), whose sum is σ = 5992047360. Its totient is φ = 1348209792.

The previous prime is 2949209833. The next prime is 2949209869. The reversal of 2949209865 is 5689029492.

It is a happy number.

2949209865 is a `hidden beast` number, since 2 + 9 + 492 + 0 + 98 + 65 = 666.

It is not a de Polignac number, because 2949209865 - 2⁵ = 2949209833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2949209869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1559484 + ... + 1561373.

It is an arithmetic number, because the mean of its divisors is an integer number (187251480).

Almost surely, 2^2949209865 is an apocalyptic number.

It is an amenable number.

2949209865 is an abundant number, since it is smaller than the sum of its proper divisors (3042837495).

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

2949209865 is a wasteful number, since it uses less digits than its factorization.

2949209865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120878 (or 3120872 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 2949209865 is about 54306.6281866219. The cubic root of 2949209865 is about 1434.0640847746.

The spelling of 2949209865 in words is "two billion, nine hundred forty-nine million, two hundred nine thousand, eight hundred sixty-five".