1285215 has 16 divisors (see below), whose sum is σ = 2101248. Its totient is φ = 670496.

The previous prime is 1285213. The next prime is 1285223. The reversal of 1285215 is 5125821.

It is a cyclic number.

It is not a de Polignac number, because 1285215 - 2¹ = 1285213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285213) 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 15 ways as a sum of consecutive naturals, for example, 207 + ... + 1616.

It is an arithmetic number, because the mean of its divisors is an integer number (131328).

2^1285215 is an apocalyptic number.

1285215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1285215 is a deficient number, since it is larger than the sum of its proper divisors (816033).

1285215 is a wasteful number, since it uses less digits than its factorization.

1285215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1878.

The product of its digits is 800, while the sum is 24.

The square root of 1285215 is about 1133.6732333437. The cubic root of 1285215 is about 108.7239599431.

Subtracting 1285215 from its reverse (5125821), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 1285215 in words is "one million, two hundred eighty-five thousand, two hundred fifteen".