1285305 has 16 divisors (see below), whose sum is σ = 2350464. Its totient is φ = 587520.

The previous prime is 1285301. The next prime is 1285351. The reversal of 1285305 is 5035821.

1285305 = 354² + 355² + ... + 363².

It is not a de Polignac number, because 1285305 - 2² = 1285301 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1285301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6016 + ... + 6225.

It is an arithmetic number, because the mean of its divisors is an integer number (146904).

2^1285305 is an apocalyptic number.

1285305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1285305 is a deficient number, since it is larger than the sum of its proper divisors (1065159).

1285305 is a wasteful number, since it uses less digits than its factorization.

1285305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12256.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1285305 is about 1133.7129266265. The cubic root of 1285305 is about 108.7264977618.

The spelling of 1285305 in words is "one million, two hundred eighty-five thousand, three hundred five".