3855913215 has 64 divisors (see below), whose sum is σ = 7701212160. Its totient is φ = 1600496640.

The previous prime is 3855913169. The next prime is 3855913231. The reversal of 3855913215 is 5123195583.

3855913215 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 62096²-1.

It is not a de Polignac number, because 3855913215 - 2²¹ = 3853816063 is a prime.

It is a super-2 number, since 2×3855913215² = 29736133443223272450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1302517 + ... + 1305473.

It is an arithmetic number, because the mean of its divisors is an integer number (120331440).

Almost surely, 2^3855913215 is an apocalyptic number.

3855913215 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3855913215 is a deficient number, since it is larger than the sum of its proper divisors (3845298945).

3855913215 is a wasteful number, since it uses less digits than its factorization.

3855913215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4112.

The product of its digits is 162000, while the sum is 42.

The square root of 3855913215 is about 62095.9999919480. Note that the first 5 decimals coincide. The cubic root of 3855913215 is about 1568.1072048073.

The spelling of 3855913215 in words is "three billion, eight hundred fifty-five million, nine hundred thirteen thousand, two hundred fifteen".