1605441444 has 96 divisors (see below), whose sum is σ = 4092197760. Its totient is φ = 487938048.

The previous prime is 1605441403. The next prime is 1605441451. The reversal of 1605441444 is 4441445061.

It is a super-2 number, since 2×1605441444² = 5154884460225610272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 896502 + ... + 898290.

It is an arithmetic number, because the mean of its divisors is an integer number (42627060).

Almost surely, 2^1605441444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1605441444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2046098880).

1605441444 is an abundant number, since it is smaller than the sum of its proper divisors (2486756316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1605441444 is a wasteful number, since it uses less digits than its factorization.

1605441444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949 (or 1947 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 1605441444 is about 40067.9603174407. The cubic root of 1605441444 is about 1170.9315015905.

The spelling of 1605441444 in words is "one billion, six hundred five million, four hundred forty-one thousand, four hundred forty-four".