1820124 has 48 divisors (see below), whose sum is σ = 4972800. Its totient is φ = 574128.

The previous prime is 1820123. The next prime is 1820129. The reversal of 1820124 is 4210281.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1820097 and 1820106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1609 + ... + 2495.

It is an arithmetic number, because the mean of its divisors is an integer number (103600).

2^1820124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1820124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2486400).

1820124 is an abundant number, since it is smaller than the sum of its proper divisors (3152676).

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

1820124 is a wasteful number, since it uses less digits than its factorization.

1820124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919 (or 911 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1820124 is about 1349.1197129981. The cubic root of 1820124 is about 122.0956877178.

It can be divided in two parts, 18201 and 24, that added together give a square (18225 = 135²).

The spelling of 1820124 in words is "one million, eight hundred twenty thousand, one hundred twenty-four".