1216280 has 32 divisors (see below), whose sum is σ = 2948400. Its totient is φ = 448896.

The previous prime is 1216277. The next prime is 1216337. The reversal of 1216280 is 826121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 650 + ... + 1689.

2^1216280 is an apocalyptic number.

1216280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216280 is an abundant number, since it is smaller than the sum of its proper divisors (1732120).

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

1216280 is a wasteful number, since it uses less digits than its factorization.

1216280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363 (or 2359 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1216280 is about 1102.8508512034. The cubic root of 1216280 is about 106.7442577814.

The spelling of 1216280 in words is "one million, two hundred sixteen thousand, two hundred eighty".