3861145866 has 16 divisors (see below), whose sum is σ = 7739496000. Its totient is φ = 1284181248.

The previous prime is 3861145843. The next prime is 3861145889. The reversal of 3861145866 is 6685411683.

It is an interprime number because it is at equal distance from previous prime (3861145843) and next prime (3861145889).

It is an unprimeable number.

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, 713926 + ... + 719313.

It is an arithmetic number, because the mean of its divisors is an integer number (483718500).

Almost surely, 2^3861145866 is an apocalyptic number.

3861145866 is an abundant number, since it is smaller than the sum of its proper divisors (3878350134).

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

3861145866 is a wasteful number, since it uses less digits than its factorization.

3861145866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433693.

The product of its digits is 829440, while the sum is 48.

The square root of 3861145866 is about 62138.1192666788. The cubic root of 3861145866 is about 1568.8162153053.

The spelling of 3861145866 in words is "three billion, eight hundred sixty-one million, one hundred forty-five thousand, eight hundred sixty-six".