1215216 has 80 divisors (see below), whose sum is σ = 3645600. Its totient is φ = 387072.

The previous prime is 1215209. The next prime is 1215229. The reversal of 1215216 is 6125121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12480 + ... + 12576.

It is an arithmetic number, because the mean of its divisors is an integer number (45570).

2^1215216 is an apocalyptic number.

1215216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1822800).

1215216 is an abundant number, since it is smaller than the sum of its proper divisors (2430384).

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

1215216 is a wasteful number, since it uses less digits than its factorization.

1215216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 131 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 1215216 is about 1102.3683594879. The cubic root of 1215216 is about 106.7131221259.

It can be divided in two parts, 1215 and 216, that added together give a triangular number (1431 = T₅₃).

The spelling of 1215216 in words is "one million, two hundred fifteen thousand, two hundred sixteen".