1285216 has 12 divisors (see below), whose sum is σ = 2530332. Its totient is φ = 642592.

The previous prime is 1285213. The next prime is 1285223. The reversal of 1285216 is 6125821.

1285216 = 109² + 110² + ... + 172².

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 polite number, since it can be written as a sum of consecutive naturals, namely, 20050 + ... + 20113.

It is an arithmetic number, because the mean of its divisors is an integer number (210861).

2^1285216 is an apocalyptic number.

1285216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1285216 is a deficient number, since it is larger than the sum of its proper divisors (1245116).

1285216 is an equidigital number, since it uses as much as digits as its factorization.

1285216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40173 (or 40165 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

The square root of 1285216 is about 1133.6736743878. The cubic root of 1285216 is about 108.7239881417.

The spelling of 1285216 in words is "one million, two hundred eighty-five thousand, two hundred sixteen".