3821905 has 4 divisors (see below), whose sum is σ = 4586292. Its totient is φ = 3057520.

The previous prime is 3821903. The next prime is 3821911. The reversal of 3821905 is 5091283.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5091283 = 233 ⋅21851.

It can be written as a sum of positive squares in 2 ways, for example, as 986049 + 2835856 = 993^2 + 1684^2 .

It is not a de Polignac number, because 3821905 - 2¹ = 3821903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3821903) 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, 382186 + ... + 382195.

It is an arithmetic number, because the mean of its divisors is an integer number (1146573).

Almost surely, 2^3821905 is an apocalyptic number.

It is an amenable number.

3821905 is a deficient number, since it is larger than the sum of its proper divisors (764387).

3821905 is an equidigital number, since it uses as much as digits as its factorization.

3821905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764386.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 3821905 is about 1954.9693092220. The cubic root of 3821905 is about 156.3483476845.

The spelling of 3821905 in words is "three million, eight hundred twenty-one thousand, nine hundred five".