3858905 has 4 divisors (see below), whose sum is σ = 4630692. Its totient is φ = 3087120.

The previous prime is 3858901. The next prime is 3858923. The reversal of 3858905 is 5098583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5098583 = 7 ⋅728369.

It can be written as a sum of positive squares in 2 ways, for example, as 502681 + 3356224 = 709^2 + 1832^2 .

It is not a de Polignac number, because 3858905 - 2² = 3858901 is a prime.

It is a super-2 number, since 2×3858905² = 29782295598050, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3858901) 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 3 ways as a sum of consecutive naturals, for example, 385886 + ... + 385895.

It is an arithmetic number, because the mean of its divisors is an integer number (1157673).

Almost surely, 2^3858905 is an apocalyptic number.

It is an amenable number.

3858905 is a deficient number, since it is larger than the sum of its proper divisors (771787).

3858905 is an equidigital number, since it uses as much as digits as its factorization.

3858905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771786.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 3858905 is about 1964.4095805101. The cubic root of 3858905 is about 156.8512662306.

The spelling of 3858905 in words is "three million, eight hundred fifty-eight thousand, nine hundred five".