4081905 has 12 divisors (see below), whose sum is σ = 7075380. Its totient is φ = 2176992.

The previous prime is 4081897. The next prime is 4081933. The reversal of 4081905 is 5091804.

It can be written as a sum of positive squares in 2 ways, for example, as 2663424 + 1418481 = 1632^2 + 1191^2 .

It is not a de Polignac number, because 4081905 - 2³ = 4081897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45310 + ... + 45399.

It is an arithmetic number, because the mean of its divisors is an integer number (589615).

Almost surely, 2^4081905 is an apocalyptic number.

4081905 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4081905 is a deficient number, since it is larger than the sum of its proper divisors (2993475).

4081905 is a wasteful number, since it uses less digits than its factorization.

4081905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90720 (or 90717 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 4081905 is about 2020.3724904086. The cubic root of 4081905 is about 159.8162604335.

The spelling of 4081905 in words is "four million, eighty-one thousand, nine hundred five".