1686225 has 12 divisors (see below), whose sum is σ = 2788016. Its totient is φ = 899280.

The previous prime is 1686203. The next prime is 1686229. The reversal of 1686225 is 5226861.

It is not a de Polignac number, because 1686225 - 2⁹ = 1685713 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 = 1686192 and 1686201.

It is not an unprimeable number, because it can be changed into a prime (1686229) 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, 11167 + ... + 11316.

2^1686225 is an apocalyptic number.

1686225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1686225 is a deficient number, since it is larger than the sum of its proper divisors (1101791).

1686225 is a wasteful number, since it uses less digits than its factorization.

1686225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22496 (or 22491 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 1686225 is about 1298.5472652160. The cubic root of 1686225 is about 119.0250871008.

The spelling of 1686225 in words is "one million, six hundred eighty-six thousand, two hundred twenty-five".