1684225 has 6 divisors (see below), whose sum is σ = 2088470. Its totient is φ = 1347360.

The previous prime is 1684223. The next prime is 1684229. The reversal of 1684225 is 5224861.

It can be written as a sum of positive squares in 3 ways, for example, as 25281 + 1658944 = 159^2 + 1288^2 .

It is not a de Polignac number, because 1684225 - 2¹ = 1684223 is a prime.

It is a super-2 number, since 2×1684225² = 5673227701250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1684193 and 1684202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1684223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33660 + ... + 33709.

2^1684225 is an apocalyptic number.

It is an amenable number.

1684225 is a deficient number, since it is larger than the sum of its proper divisors (404245).

1684225 is an equidigital number, since it uses as much as digits as its factorization.

1684225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67379 (or 67374 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 1684225 is about 1297.7769453955. The cubic root of 1684225 is about 118.9780106723.

The spelling of 1684225 in words is "one million, six hundred eighty-four thousand, two hundred twenty-five".