4081945 has 12 divisors (see below), whose sum is σ = 5698404. Its totient is φ = 2798880.

The previous prime is 4081933. The next prime is 4081949. The reversal of 4081945 is 5491804.

It is a happy number.

4081945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1731856 + 2350089 = 1316^2 + 1533^2 .

It is not a de Polignac number, because 4081945 - 2²¹ = 1984793 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4081949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8086 + ... + 8575.

It is an arithmetic number, because the mean of its divisors is an integer number (474867).

Almost surely, 2^4081945 is an apocalyptic number.

It is an amenable number.

4081945 is a deficient number, since it is larger than the sum of its proper divisors (1616459).

4081945 is a wasteful number, since it uses less digits than its factorization.

4081945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16680 (or 16673 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 4081945 is about 2020.3823895491. The cubic root of 4081945 is about 159.8167824634.

The spelling of 4081945 in words is "four million, eighty-one thousand, nine hundred forty-five".