1229820 has 48 divisors (see below), whose sum is σ = 3494400. Its totient is φ = 323136.

The previous prime is 1229807. The next prime is 1229827. The reversal of 1229820 is 289221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229827) 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, 6081 + ... + 6279.

It is an arithmetic number, because the mean of its divisors is an integer number (72800).

2^1229820 is an apocalyptic number.

1229820 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 1229820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1747200).

1229820 is an abundant number, since it is smaller than the sum of its proper divisors (2264580).

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

1229820 is a wasteful number, since it uses less digits than its factorization.

1229820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 312 counting only the distinct ones).

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

The square root of 1229820 is about 1108.9724974047. The cubic root of 1229820 is about 107.1389001713.

The spelling of 1229820 in words is "one million, two hundred twenty-nine thousand, eight hundred twenty".