3855869 has 4 divisors (see below), whose sum is σ = 3988860. Its totient is φ = 3722880.

The previous prime is 3855857. The next prime is 3855913. The reversal of 3855869 is 9685583.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1923769 + 1932100 = 1387^2 + 1390^2 .

It is a cyclic number.

It is not a de Polignac number, because 3855869 - 2¹⁶ = 3790333 is a prime.

It is a super-2 number, since 2×3855869² = 29735451490322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3855829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66452 + ... + 66509.

It is an arithmetic number, because the mean of its divisors is an integer number (997215).

Almost surely, 2^3855869 is an apocalyptic number.

It is an amenable number.

3855869 is a deficient number, since it is larger than the sum of its proper divisors (132991).

3855869 is a wasteful number, since it uses less digits than its factorization.

3855869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132990.

The product of its digits is 259200, while the sum is 44.

The square root of 3855869 is about 1963.6366771885. The cubic root of 3855869 is about 156.8101211059.

The spelling of 3855869 in words is "three million, eight hundred fifty-five thousand, eight hundred sixty-nine".