1284216 has 32 divisors (see below), whose sum is σ = 3258960. Its totient is φ = 421632.

The previous prime is 1284211. The next prime is 1284223. The reversal of 1284216 is 6124821.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1386 + ... + 2118.

2^1284216 is an apocalyptic number.

It is an amenable number.

1284216 is an abundant number, since it is smaller than the sum of its proper divisors (1974744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1284216 is a wasteful number, since it uses less digits than its factorization.

1284216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 811 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

The square root of 1284216 is about 1133.2325445380. The cubic root of 1284216 is about 108.6957821958.

The spelling of 1284216 in words is "one million, two hundred eighty-four thousand, two hundred sixteen".