1285245 has 30 divisors (see below), whose sum is σ = 2413398. Its totient is φ = 632736.

The previous prime is 1285237. The next prime is 1285247. The reversal of 1285245 is 5425821.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 1153476 + 131769 = 1074^2 + 363^2 .

It is not a de Polignac number, because 1285245 - 2³ = 1285237 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 98859 + ... + 98871.

2^1285245 is an apocalyptic number.

1285245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1285245 is a deficient number, since it is larger than the sum of its proper divisors (1128153).

1285245 is an frugal number, since it uses more digits than its factorization.

1285245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63 (or 21 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 1285245 is about 1133.6864645924. The cubic root of 1285245 is about 108.7248058958.

The spelling of 1285245 in words is "one million, two hundred eighty-five thousand, two hundred forty-five".