1605907745 has 8 divisors (see below), whose sum is σ = 2075327016. Its totient is φ = 1185901056.

The previous prime is 1605907733. The next prime is 1605907753. The reversal of 1605907745 is 5477095061.

It can be written as a sum of positive squares in 4 ways, for example, as 1745041 + 1604162704 = 1321^2 + 40052^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1605907745 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1605907696 and 1605907705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12353072 + ... + 12353201.

It is an arithmetic number, because the mean of its divisors is an integer number (259415877).

Almost surely, 2^1605907745 is an apocalyptic number.

It is an amenable number.

1605907745 is a deficient number, since it is larger than the sum of its proper divisors (469419271).

1605907745 is a wasteful number, since it uses less digits than its factorization.

1605907745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24706291.

The product of its (nonzero) digits is 264600, while the sum is 44.

The square root of 1605907745 is about 40073.7787711616. The cubic root of 1605907745 is about 1171.0448564309.

The spelling of 1605907745 in words is "one billion, six hundred five million, nine hundred seven thousand, seven hundred forty-five".