3870186861 has 12 divisors (see below), whose sum is σ = 5238435552. Its totient is φ = 2541606408.

The previous prime is 3870186857. The next prime is 3870186863. The reversal of 3870186861 is 1686810783.

It is not a de Polignac number, because 3870186861 - 2² = 3870186857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3870186861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3870186863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 130225 + ... + 157158.

It is an arithmetic number, because the mean of its divisors is an integer number (436536296).

Almost surely, 2^3870186861 is an apocalyptic number.

It is an amenable number.

3870186861 is a deficient number, since it is larger than the sum of its proper divisors (1368248691).

3870186861 is an equidigital number, since it uses as much as digits as its factorization.

3870186861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287520 (or 287453 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 3870186861 is about 62210.8259147875. The cubic root of 3870186861 is about 1570.0397384021.

The spelling of 3870186861 in words is "three billion, eight hundred seventy million, one hundred eighty-six thousand, eight hundred sixty-one".