1228780 has 48 divisors (see below), whose sum is σ = 3015936. Its totient is φ = 411840.

The previous prime is 1228763. The next prime is 1228783. The reversal of 1228780 is 878221.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (1228783) 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, 9315 + ... + 9445.

It is an arithmetic number, because the mean of its divisors is an integer number (62832).

2^1228780 is an apocalyptic number.

1228780 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 1228780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1507968).

1228780 is an abundant number, since it is smaller than the sum of its proper divisors (1787156).

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

1228780 is a wasteful number, since it uses less digits than its factorization.

1228780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 1228780 is about 1108.5034957094. The cubic root of 1228780 is about 107.1086909050.

The spelling of 1228780 in words is "one million, two hundred twenty-eight thousand, seven hundred eighty".