1818720 has 96 divisors (see below), whose sum is σ = 6380640. Its totient is φ = 483840.

The previous prime is 1818703. The next prime is 1818721. The reversal of 1818720 is 278181.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818721) 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, 4110 + ... + 4530.

It is an arithmetic number, because the mean of its divisors is an integer number (66465).

2^1818720 is an apocalyptic number.

1818720 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 1818720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3190320).

1818720 is an abundant number, since it is smaller than the sum of its proper divisors (4561920).

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

1818720 is a wasteful number, since it uses less digits than its factorization.

1818720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 1818720 is about 1348.5992733203. The cubic root of 1818720 is about 122.0642857472.

The spelling of 1818720 in words is "one million, eight hundred eighteen thousand, seven hundred twenty".