1228920 has 192 divisors, whose sum is σ = 4924800. Its totient is φ = 241920.

The previous prime is 1228919. The next prime is 1228937. The reversal of 1228920 is 298221.

1228920 = 11² + 12² + ... + 154².

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64671 + ... + 64689.

It is an arithmetic number, because the mean of its divisors is an integer number (25650).

2^1228920 is an apocalyptic number.

1228920 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 1228920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2462400).

1228920 is an abundant number, since it is smaller than the sum of its proper divisors (3695880).

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

1228920 is a wasteful number, since it uses less digits than its factorization.

1228920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1228920 is about 1108.5666421104. The cubic root of 1228920 is about 107.1127585296.

The spelling of 1228920 in words is "one million, two hundred twenty-eight thousand, nine hundred twenty".