3855389440 has 72 divisors (see below), whose sum is σ = 10554153120. Its totient is φ = 1321844736.

The previous prime is 3855389429. The next prime is 3855389443. The reversal of 3855389440 is 449835583.

It is not an unprimeable number, because it can be changed into a prime (3855389443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206185 + ... + 224104.

It is an arithmetic number, because the mean of its divisors is an integer number (146585460).

Almost surely, 2^3855389440 is an apocalyptic number.

It is an amenable number.

3855389440 is an abundant number, since it is smaller than the sum of its proper divisors (6698763680).

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

3855389440 is an equidigital number, since it uses as much as digits as its factorization.

3855389440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430317 (or 430303 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 49.

The square root of 3855389440 is about 62091.7823870438. The cubic root of 3855389440 is about 1568.0361993586.

The spelling of 3855389440 in words is "three billion, eight hundred fifty-five million, three hundred eighty-nine thousand, four hundred forty".