3865628 has 24 divisors (see below), whose sum is σ = 7385280. Its totient is φ = 1759680.

The previous prime is 3865601. The next prime is 3865637. The reversal of 3865628 is 8265683.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 3865591 and 3865600.

It is a congruent number.

It is an unprimeable number.

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, 3638 + ... + 4578.

It is an arithmetic number, because the mean of its divisors is an integer number (307720).

Almost surely, 2^3865628 is an apocalyptic number.

It is an amenable number.

3865628 is a deficient number, since it is larger than the sum of its proper divisors (3519652).

3865628 is a wasteful number, since it uses less digits than its factorization.

3865628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037 (or 1035 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 3865628 is about 1966.1200370272. The cubic root of 3865628 is about 156.9423023547.

Subtracting from 3865628 its sum of digits (38), we obtain a triangular number (3865590 = T₂₇₈₀).

The spelling of 3865628 in words is "three million, eight hundred sixty-five thousand, six hundred twenty-eight".