1216500 has 48 divisors (see below), whose sum is σ = 3546816. Its totient is φ = 324000.

The previous prime is 1216489. The next prime is 1216507. The reversal of 1216500 is 56121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1216500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1095 + ... + 1905.

It is an arithmetic number, because the mean of its divisors is an integer number (73892).

2^1216500 is an apocalyptic number.

1216500 is a gapful number since it is divisible by the number (10) 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 1216500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1773408).

1216500 is an abundant number, since it is smaller than the sum of its proper divisors (2330316).

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

1216500 is a wasteful number, since it uses less digits than its factorization.

1216500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1216500 is about 1102.9505881951. The cubic root of 1216500 is about 106.7506933392.

The spelling of 1216500 in words is "one million, two hundred sixteen thousand, five hundred".