1216287 has 12 divisors (see below), whose sum is σ = 1770600. Its totient is φ = 804528.

The previous prime is 1216277. The next prime is 1216337. The reversal of 1216287 is 7826121.

It is not a de Polignac number, because 1216287 - 2¹² = 1212191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 888 + ... + 1794.

It is an arithmetic number, because the mean of its divisors is an integer number (147550).

2^1216287 is an apocalyptic number.

1216287 is a deficient number, since it is larger than the sum of its proper divisors (554313).

1216287 is a wasteful number, since it uses less digits than its factorization.

1216287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062 (or 1059 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 1216287 is about 1102.8540247920. The cubic root of 1216287 is about 106.7444625611.

The spelling of 1216287 in words is "one million, two hundred sixteen thousand, two hundred eighty-seven".