3865641 has 8 divisors (see below), whose sum is σ = 5550720. Its totient is φ = 2378832.

The previous prime is 3865637. The next prime is 3865663. The reversal of 3865641 is 1465683.

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

It is not a de Polignac number, because 3865641 - 2² = 3865637 is a prime.

3865641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3865601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49521 + ... + 49598.

It is an arithmetic number, because the mean of its divisors is an integer number (693840).

Almost surely, 2^3865641 is an apocalyptic number.

It is an amenable number.

3865641 is a deficient number, since it is larger than the sum of its proper divisors (1685079).

3865641 is a wasteful number, since it uses less digits than its factorization.

3865641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99135.

The product of its digits is 17280, while the sum is 33.

The square root of 3865641 is about 1966.1233430281. The cubic root of 3865641 is about 156.9424782854.

The spelling of 3865641 in words is "three million, eight hundred sixty-five thousand, six hundred forty-one".