1605856244 has 18 divisors (see below), whose sum is σ = 2985283350. Its totient is φ = 755696512.

The previous prime is 1605856207. The next prime is 1605856249. The reversal of 1605856244 is 4426585061.

It can be written as a sum of positive squares in 3 ways, for example, as 747366244 + 858490000 = 27338^2 + 29300^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605856249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 693419 + ... + 695730.

It is an arithmetic number, because the mean of its divisors is an integer number (165849075).

Almost surely, 2^1605856244 is an apocalyptic number.

It is an amenable number.

1605856244 is a deficient number, since it is larger than the sum of its proper divisors (1379427106).

1605856244 is a wasteful number, since it uses less digits than its factorization.

1605856244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389187 (or 1389168 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 41.

The square root of 1605856244 is about 40073.1361887237. The cubic root of 1605856244 is about 1171.0323379397.

The spelling of 1605856244 in words is "one billion, six hundred five million, eight hundred fifty-six thousand, two hundred forty-four".