1820480 has 28 divisors (see below), whose sum is σ = 4335780. Its totient is φ = 728064.

The previous prime is 1820471. The next prime is 1820501. The reversal of 1820480 is 840281.

It can be written as a sum of positive squares in 2 ways, for example, as 1290496 + 529984 = 1136^2 + 728^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2525 + ... + 3164.

2^1820480 is an apocalyptic number.

1820480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820480 is an abundant number, since it is smaller than the sum of its proper divisors (2515300).

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

1820480 is an equidigital number, since it uses as much as digits as its factorization.

1820480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5706 (or 5696 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 1820480 is about 1349.2516444311. The cubic root of 1820480 is about 122.1036474743.

The spelling of 1820480 in words is "one million, eight hundred twenty thousand, four hundred eighty".