1216880 has 80 divisors (see below), whose sum is σ = 3374784. Its totient is φ = 399360.

The previous prime is 1216879. The next prime is 1216903. The reversal of 1216880 is 886121.

It is a tau number, because it is divible by the number of its divisors (80).

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, 22934 + ... + 22986.

2^1216880 is an apocalyptic number.

1216880 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 1216880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1687392).

1216880 is an abundant number, since it is smaller than the sum of its proper divisors (2157904).

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

1216880 is a wasteful number, since it uses less digits than its factorization.

1216880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 1216880 is about 1103.1228399412. The cubic root of 1216880 is about 106.7618074755.

The spelling of 1216880 in words is "one million, two hundred sixteen thousand, eight hundred eighty".