1820723 has 4 divisors (see below), whose sum is σ = 1879488. Its totient is φ = 1761960.

The previous prime is 1820711. The next prime is 1820737. The reversal of 1820723 is 3270281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3270281 = 7 ⋅467183.

It is a cyclic number.

It is not a de Polignac number, because 1820723 - 2¹² = 1816627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1820743) 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 3 ways as a sum of consecutive naturals, for example, 29336 + ... + 29397.

It is an arithmetic number, because the mean of its divisors is an integer number (469872).

2^1820723 is an apocalyptic number.

1820723 is a deficient number, since it is larger than the sum of its proper divisors (58765).

1820723 is an equidigital number, since it uses as much as digits as its factorization.

1820723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58764.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1820723 is about 1349.3416913443. The cubic root of 1820723 is about 122.1090800830.

The spelling of 1820723 in words is "one million, eight hundred twenty thousand, seven hundred twenty-three".