3855139 has 4 divisors (see below), whose sum is σ = 3918400. Its totient is φ = 3791880.

The previous prime is 3855133. The next prime is 3855143. The reversal of 3855139 is 9315583.

3855139 is nontrivially palindromic in base 9.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9315583 = 29 ⋅321227.

It is a cyclic number.

It is not a de Polignac number, because 3855139 - 2¹⁷ = 3724067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3855133) 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, 31539 + ... + 31660.

It is an arithmetic number, because the mean of its divisors is an integer number (979600).

Almost surely, 2^3855139 is an apocalyptic number.

3855139 is a deficient number, since it is larger than the sum of its proper divisors (63261).

3855139 is an equidigital number, since it uses as much as digits as its factorization.

3855139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63260.

The product of its digits is 16200, while the sum is 34.

The square root of 3855139 is about 1963.4507887900. The cubic root of 3855139 is about 156.8002246240.

The spelling of 3855139 in words is "three million, eight hundred fifty-five thousand, one hundred thirty-nine".