1605607925 has 12 divisors (see below), whose sum is σ = 2108069316. Its totient is φ = 1208928000.

The previous prime is 1605607921. The next prime is 1605607931. The reversal of 1605607925 is 5297065061.

It can be written as a sum of positive squares in 6 ways, for example, as 36893476 + 1568714449 = 6074^2 + 39607^2 .

It is not a de Polignac number, because 1605607925 - 2² = 1605607921 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 (1605607921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1888526 + ... + 1889375.

It is an arithmetic number, because the mean of its divisors is an integer number (175672443).

Almost surely, 2^1605607925 is an apocalyptic number.

It is an amenable number.

1605607925 is a deficient number, since it is larger than the sum of its proper divisors (502461391).

1605607925 is a wasteful number, since it uses less digits than its factorization.

1605607925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3777928 (or 3777923 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 1605607925 is about 40070.0377464259. The cubic root of 1605607925 is about 1170.9719745935.

The spelling of 1605607925 in words is "one billion, six hundred five million, six hundred seven thousand, nine hundred twenty-five".