1820730 has 32 divisors (see below), whose sum is σ = 4411584. Its totient is φ = 480896.

The previous prime is 1820711. The next prime is 1820737. The reversal of 1820730 is 370281.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1820697 and 1820706.

It is not an unprimeable number, because it can be changed into a prime (1820737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3889 + ... + 4331.

It is an arithmetic number, because the mean of its divisors is an integer number (137862).

2^1820730 is an apocalyptic number.

1820730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1820730 is an abundant number, since it is smaller than the sum of its proper divisors (2590854).

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

1820730 is a wasteful number, since it uses less digits than its factorization.

1820730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1820730 is about 1349.3442851993. The cubic root of 1820730 is about 122.1092365707.

The spelling of 1820730 in words is "one million, eight hundred twenty thousand, seven hundred thirty".