1605897 has 12 divisors (see below), whose sum is σ = 2342340. Its totient is φ = 1060128.

The previous prime is 1605889. The next prime is 1605907. The reversal of 1605897 is 7985061.

It can be written as a sum of positive squares in 2 ways, for example, as 484416 + 1121481 = 696^2 + 1059^2 .

It is not a de Polignac number, because 1605897 - 2³ = 1605889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1605887) 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, 163 + ... + 1799.

It is an arithmetic number, because the mean of its divisors is an integer number (195195).

2^1605897 is an apocalyptic number.

It is an amenable number.

1605897 is a deficient number, since it is larger than the sum of its proper divisors (736443).

1605897 is a wasteful number, since it uses less digits than its factorization.

1605897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752 (or 1749 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 1605897 is about 1267.2399141441. The cubic root of 1605897 is about 117.1042244636.

The spelling of 1605897 in words is "one million, six hundred five thousand, eight hundred ninety-seven".