1688225 has 24 divisors (see below), whose sum is σ = 2612928. Its totient is φ = 1051200.

The previous prime is 1688213. The next prime is 1688231. The reversal of 1688225 is 5228861.

It is not a de Polignac number, because 1688225 - 2⁶ = 1688161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1688191 and 1688200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1487 + ... + 2363.

It is an arithmetic number, because the mean of its divisors is an integer number (108872).

2^1688225 is an apocalyptic number.

It is an amenable number.

1688225 is a deficient number, since it is larger than the sum of its proper divisors (924703).

1688225 is a wasteful number, since it uses less digits than its factorization.

1688225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905 (or 900 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 1688225 is about 1299.3171283409. The cubic root of 1688225 is about 119.0721263196.

The spelling of 1688225 in words is "one million, six hundred eighty-eight thousand, two hundred twenty-five".