1660625 has 10 divisors (see below), whose sum is σ = 2075898. Its totient is φ = 1328000.

The previous prime is 1660609. The next prime is 1660661. The reversal of 1660625 is 5260661.

It can be written as a sum of positive squares in 5 ways, for example, as 528529 + 1132096 = 727^2 + 1064^2 .

It is not a de Polignac number, because 1660625 - 2⁴ = 1660609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1660594 and 1660603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 704 + ... + 1953.

2^1660625 is an apocalyptic number.

It is an amenable number.

1660625 is a deficient number, since it is larger than the sum of its proper divisors (415273).

1660625 is an frugal number, since it uses more digits than its factorization.

1660625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677 (or 2662 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1660625 is about 1288.6523968860. The cubic root of 1660625 is about 118.4196729317.

The spelling of 1660625 in words is "one million, six hundred sixty thousand, six hundred twenty-five".