3855021 has 8 divisors (see below), whose sum is σ = 5149440. Its totient is φ = 2565312.

The previous prime is 3855013. The next prime is 3855023. The reversal of 3855021 is 1205583.

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

It is not a de Polignac number, because 3855021 - 2³ = 3855013 is a prime.

It is a super-2 number, since 2×3855021² = 29722373820882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3854982 and 3855000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3855023) 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, 1845 + ... + 3333.

It is an arithmetic number, because the mean of its divisors is an integer number (643680).

Almost surely, 2^3855021 is an apocalyptic number.

It is an amenable number.

3855021 is a deficient number, since it is larger than the sum of its proper divisors (1294419).

3855021 is a wasteful number, since it uses less digits than its factorization.

3855021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 3855021 is about 1963.4207394239. The cubic root of 3855021 is about 156.7986248014.

The spelling of 3855021 in words is "three million, eight hundred fifty-five thousand, twenty-one".