1228840 has 32 divisors (see below), whose sum is σ = 2856960. Its totient is φ = 475200.

The previous prime is 1228837. The next prime is 1228841. The reversal of 1228840 is 488221.

It is not an unprimeable number, because it can be changed into a prime (1228841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745 + ... + 1735.

It is an arithmetic number, because the mean of its divisors is an integer number (89280).

2^1228840 is an apocalyptic number.

1228840 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 1228840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1428480).

1228840 is an abundant number, since it is smaller than the sum of its proper divisors (1628120).

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

1228840 is a wasteful number, since it uses less digits than its factorization.

1228840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033 (or 1029 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 1228840 is about 1108.5305588932. The cubic root of 1228840 is about 107.1104342105.

The spelling of 1228840 in words is "one million, two hundred twenty-eight thousand, eight hundred forty".