1820623 has 4 divisors (see below), whose sum is σ = 2080720. Its totient is φ = 1560528.

The previous prime is 1820617. The next prime is 1820629. The reversal of 1820623 is 3260281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3260281 = 59 ⋅55259.

It is an interprime number because it is at equal distance from previous prime (1820617) and next prime (1820629).

It is a cyclic number.

It is not a de Polignac number, because 1820623 - 2⁹ = 1820111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1820594 and 1820603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130038 + ... + 130051.

It is an arithmetic number, because the mean of its divisors is an integer number (520180).

2^1820623 is an apocalyptic number.

1820623 is a deficient number, since it is larger than the sum of its proper divisors (260097).

1820623 is an equidigital number, since it uses as much as digits as its factorization.

1820623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260096.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1820623 is about 1349.3046357291. The cubic root of 1820623 is about 122.1068445001.

The spelling of 1820623 in words is "one million, eight hundred twenty thousand, six hundred twenty-three".