3839440905 has 80 divisors (see below), whose sum is σ = 7363818000. Its totient is φ = 1907048448.

The previous prime is 3839440897. The next prime is 3839440909. The reversal of 3839440905 is 5090449383.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 285373449 + 3554067456 = 16893^2 + 59616^2 .

It is not a de Polignac number, because 3839440905 - 2³ = 3839440897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3839440909) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 664971 + ... + 670719.

It is an arithmetic number, because the mean of its divisors is an integer number (92047725).

Almost surely, 2^3839440905 is an apocalyptic number.

It is an amenable number.

3839440905 is a deficient number, since it is larger than the sum of its proper divisors (3524377095).

3839440905 is a wasteful number, since it uses less digits than its factorization.

3839440905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5880 (or 5871 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 3839440905 is about 61963.2221967192. Note that the first 3 decimals coincide. The cubic root of 3839440905 is about 1565.8710533717.

The spelling of 3839440905 in words is "three billion, eight hundred thirty-nine million, four hundred forty thousand, nine hundred five".