1216980 has 36 divisors (see below), whose sum is σ = 3692052. Its totient is φ = 324480.

The previous prime is 1216973. The next prime is 1216987. The reversal of 1216980 is 896121.

It is an interprime number because it is at equal distance from previous prime (1216973) and next prime (1216987).

It can be written as a sum of positive squares in 2 ways, for example, as 715716 + 501264 = 846^2 + 708^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216987) 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, 3201 + ... + 3560.

It is an arithmetic number, because the mean of its divisors is an integer number (102557).

2^1216980 is an apocalyptic number.

1216980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216980 is an abundant number, since it is smaller than the sum of its proper divisors (2475072).

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

1216980 is a wasteful number, since it uses less digits than its factorization.

1216980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6776 (or 6771 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1216980 is about 1103.1681648779. The cubic root of 1216980 is about 106.7647318636.

The spelling of 1216980 in words is "one million, two hundred sixteen thousand, nine hundred eighty".