1818920 has 32 divisors (see below), whose sum is σ = 4206600. Its totient is φ = 707328.

The previous prime is 1818919. The next prime is 1818923. The reversal of 1818920 is 298181.

It can be written as a sum of positive squares in 4 ways, for example, as 1800964 + 17956 = 1342^2 + 134^2 .

It is not an unprimeable number, because it can be changed into a prime (1818923) 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, 866 + ... + 2094.

2^1818920 is an apocalyptic number.

1818920 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 1818920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2103300).

1818920 is an abundant number, since it is smaller than the sum of its proper divisors (2387680).

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

1818920 is a wasteful number, since it uses less digits than its factorization.

1818920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277 (or 1273 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1818920 is about 1348.6734222932. The cubic root of 1818920 is about 122.0687599492.

The spelling of 1818920 in words is "one million, eight hundred eighteen thousand, nine hundred twenty".