1623820 has 48 divisors (see below), whose sum is σ = 3812256. Its totient is φ = 580800.

The previous prime is 1623799. The next prime is 1623827. The reversal of 1623820 is 283261.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1623791 and 1623800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623827) 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, 26590 + ... + 26650.

It is an arithmetic number, because the mean of its divisors is an integer number (79422).

2^1623820 is an apocalyptic number.

1623820 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 1623820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1906128).

1623820 is an abundant number, since it is smaller than the sum of its proper divisors (2188436).

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

1623820 is a wasteful number, since it uses less digits than its factorization.

1623820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1623820 is about 1274.2919602666. The cubic root of 1623820 is about 117.5382703164.

The spelling of 1623820 in words is "one million, six hundred twenty-three thousand, eight hundred twenty".