3865739136 has 128 divisors (see below), whose sum is σ = 11765088000. Its totient is φ = 1101692928.

The previous prime is 3865739131. The next prime is 3865739197. The reversal of 3865739136 is 6319375683.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865739131) 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 15 ways as a sum of consecutive naturals, for example, 1205311 + ... + 1208513.

It is an arithmetic number, because the mean of its divisors is an integer number (91914750).

Almost surely, 2^3865739136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3865739136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5882544000).

3865739136 is an abundant number, since it is smaller than the sum of its proper divisors (7899348864).

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

3865739136 is a wasteful number, since it uses less digits than its factorization.

3865739136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3676 (or 3664 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 51.

The square root of 3865739136 is about 62175.0684438707. The cubic root of 3865739136 is about 1569.4380635981.

The spelling of 3865739136 in words is "three billion, eight hundred sixty-five million, seven hundred thirty-nine thousand, one hundred thirty-six".