3857864815 has 12 divisors (see below), whose sum is σ = 5385264696. Its totient is φ = 2645392848.

The previous prime is 3857864807. The next prime is 3857864831. The reversal of 3857864815 is 5184687583.

It is not a de Polignac number, because 3857864815 - 2³ = 3857864807 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 7872949 + ... + 7873438.

It is an arithmetic number, because the mean of its divisors is an integer number (448772058).

Almost surely, 2^3857864815 is an apocalyptic number.

3857864815 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3857864815 is a deficient number, since it is larger than the sum of its proper divisors (1527399881).

3857864815 is a wasteful number, since it uses less digits than its factorization.

3857864815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15746406 (or 15746399 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 55.

The square root of 3857864815 is about 62111.7123818044. The cubic root of 3857864815 is about 1568.3717164536.

The spelling of 3857864815 in words is "three billion, eight hundred fifty-seven million, eight hundred sixty-four thousand, eight hundred fifteen".