3789856665 has 48 divisors (see below), whose sum is σ = 7949155968. Its totient is φ = 1630591488.

The previous prime is 3789856649. The next prime is 3789856667. The reversal of 3789856665 is 5666589873.

It is not a de Polignac number, because 3789856665 - 2⁴ = 3789856649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3789856667) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 348507 + ... + 359216.

It is an arithmetic number, because the mean of its divisors is an integer number (165607416).

Almost surely, 2^3789856665 is an apocalyptic number.

3789856665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3789856665 is an abundant number, since it is smaller than the sum of its proper divisors (4159299303).

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

3789856665 is a wasteful number, since it uses less digits than its factorization.

3789856665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707758 (or 707755 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 63.

The square root of 3789856665 is about 61561.8117423456. The cubic root of 3789856665 is about 1559.1010414879.

The spelling of 3789856665 in words is "three billion, seven hundred eighty-nine million, eight hundred fifty-six thousand, six hundred sixty-five".