1806720 has 64 divisors (see below), whose sum is σ = 5765040. Its totient is φ = 481280.

The previous prime is 1806713. The next prime is 1806733. The reversal of 1806720 is 276081.

It is a tau number, because it is divible by the number of its divisors (64).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1450 + ... + 2390.

2^1806720 is an apocalyptic number.

1806720 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 1806720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2882520).

1806720 is an abundant number, since it is smaller than the sum of its proper divisors (3958320).

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

1806720 is an equidigital number, since it uses as much as digits as its factorization.

1806720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963 (or 951 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 1806720 is about 1344.1428495513. The cubic root of 1806720 is about 121.7952311678.

The spelling of 1806720 in words is "one million, eight hundred six thousand, seven hundred twenty".