3861001947 has 24 divisors (see below), whose sum is σ = 5662278160. Its totient is φ = 2338459200.

The previous prime is 3861001891. The next prime is 3861001957. The reversal of 3861001947 is 7491001683.

It is not a de Polignac number, because 3861001947 - 2⁶ = 3861001883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3861001957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 803829 + ... + 808617.

Almost surely, 2^3861001947 is an apocalyptic number.

3861001947 is a deficient number, since it is larger than the sum of its proper divisors (1801276213).

3861001947 is a wasteful number, since it uses less digits than its factorization.

3861001947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7035 (or 7024 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 3861001947 is about 62136.9611986296. The cubic root of 3861001947 is about 1568.7967232276.

The spelling of 3861001947 in words is "three billion, eight hundred sixty-one million, one thousand, nine hundred forty-seven".