1285225 has 12 divisors (see below), whose sum is σ = 1612620. Its totient is φ = 1016000.

The previous prime is 1285223. The next prime is 1285231. The reversal of 1285225 is 5225821.

It can be written as a sum of positive squares in 6 ways, for example, as 127449 + 1157776 = 357^2 + 1076^2 .

It is not a de Polignac number, because 1285225 - 2¹ = 1285223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an Ulam number.

1285225 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1285225.

It is not an unprimeable number, because it can be changed into a prime (1285223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2271 + ... + 2779.

It is an arithmetic number, because the mean of its divisors is an integer number (134385).

2^1285225 is an apocalyptic number.

It is an amenable number.

1285225 is a deficient number, since it is larger than the sum of its proper divisors (327395).

1285225 is a wasteful number, since it uses less digits than its factorization.

1285225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 615 counting only the distinct ones).

The product of its digits is 1600, while the sum is 25.

The square root of 1285225 is about 1133.6776437771. The cubic root of 1285225 is about 108.7242419288.

The spelling of 1285225 in words is "one million, two hundred eighty-five thousand, two hundred twenty-five".