1656225 has 36 divisors (see below), whose sum is σ = 3148236. Its totient is φ = 829440.

The previous prime is 1656223. The next prime is 1656227. The reversal of 1656225 is 5226561.

1656225 is a `hidden beast` number, since 1 + 656 + 2 + 2 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1656223) and next prime (1656227).

It can be written as a sum of positive squares in 6 ways, for example, as 76176 + 1580049 = 276^2 + 1257^2 .

It is not a de Polignac number, because 1656225 - 2¹ = 1656223 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656223) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3609 + ... + 4041.

It is an arithmetic number, because the mean of its divisors is an integer number (87451).

2^1656225 is an apocalyptic number.

1656225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1656225 is a deficient number, since it is larger than the sum of its proper divisors (1492011).

1656225 is a wasteful number, since it uses less digits than its factorization.

1656225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 458 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1656225 is about 1286.9440547281. The cubic root of 1656225 is about 118.3149919775.

It can be divided in two parts, 1656 and 225, that added together give a palindrome (1881).

The spelling of 1656225 in words is "one million, six hundred fifty-six thousand, two hundred twenty-five".