1227780 has 72 divisors (see below), whose sum is σ = 3931200. Its totient is φ = 309312.

The previous prime is 1227769. The next prime is 1227797. The reversal of 1227780 is 877221.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3241 + ... + 3599.

It is an arithmetic number, because the mean of its divisors is an integer number (54600).

2^1227780 is an apocalyptic number.

1227780 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 1227780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1965600).

1227780 is an abundant number, since it is smaller than the sum of its proper divisors (2703420).

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

1227780 is a wasteful number, since it uses less digits than its factorization.

1227780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 1227780 is about 1108.0523453339. The cubic root of 1227780 is about 107.0796274546.

The spelling of 1227780 in words is "one million, two hundred twenty-seven thousand, seven hundred eighty".