3865491847 has 8 divisors (see below), whose sum is σ = 4420132352. Its totient is φ = 3311458200.

The previous prime is 3865491823. The next prime is 3865491857. The reversal of 3865491847 is 7481945683.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3865491847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865491857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137979 + ... + 163612.

It is an arithmetic number, because the mean of its divisors is an integer number (552516544).

Almost surely, 2^3865491847 is an apocalyptic number.

3865491847 is a deficient number, since it is larger than the sum of its proper divisors (554640505).

3865491847 is a wasteful number, since it uses less digits than its factorization.

3865491847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303429.

The product of its digits is 5806080, while the sum is 55.

The square root of 3865491847 is about 62173.0797612600. The cubic root of 3865491847 is about 1569.4045975492.

The spelling of 3865491847 in words is "three billion, eight hundred sixty-five million, four hundred ninety-one thousand, eight hundred forty-seven".