1216487 has 4 divisors (see below), whose sum is σ = 1222800. Its totient is φ = 1210176.

The previous prime is 1216459. The next prime is 1216489. The reversal of 1216487 is 7846121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7846121 = 2657 ⋅2953.

It is a cyclic number.

It is not a de Polignac number, because 1216487 - 2¹⁰ = 1215463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216489) 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 3 ways as a sum of consecutive naturals, for example, 2858 + ... + 3255.

It is an arithmetic number, because the mean of its divisors is an integer number (305700).

2^1216487 is an apocalyptic number.

1216487 is a deficient number, since it is larger than the sum of its proper divisors (6313).

1216487 is an equidigital number, since it uses as much as digits as its factorization.

1216487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6312.

The product of its digits is 2688, while the sum is 29.

The square root of 1216487 is about 1102.9446948963. The cubic root of 1216487 is about 106.7503130778.

The spelling of 1216487 in words is "one million, two hundred sixteen thousand, four hundred eighty-seven".