1690625 has 12 divisors (see below), whose sum is σ = 2117052. Its totient is φ = 1350000.

The previous prime is 1690621. The next prime is 1690651. The reversal of 1690625 is 5260961.

It can be written as a sum of positive squares in 6 ways, for example, as 1459264 + 231361 = 1208^2 + 481^2 .

It is not a de Polignac number, because 1690625 - 2² = 1690621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1690621) 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, 2855 + ... + 3395.

It is an arithmetic number, because the mean of its divisors is an integer number (176421).

2^1690625 is an apocalyptic number.

It is an amenable number.

1690625 is a deficient number, since it is larger than the sum of its proper divisors (426427).

1690625 is an frugal number, since it uses more digits than its factorization.

1690625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 1690625 is about 1300.2403623946. The cubic root of 1690625 is about 119.1285243690.

The spelling of 1690625 in words is "one million, six hundred ninety thousand, six hundred twenty-five".