1808623 has 4 divisors (see below), whose sum is σ = 1850728. Its totient is φ = 1766520.

The previous prime is 1808617. The next prime is 1808627. The reversal of 1808623 is 3268081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3268081 = 269 ⋅12149.

It is a cyclic number.

It is not a de Polignac number, because 1808623 - 2¹³ = 1800431 is a prime.

It is a super-2 number, since 2×1808623² = 6542234312258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1808591 and 1808600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808627) 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, 20988 + ... + 21073.

It is an arithmetic number, because the mean of its divisors is an integer number (462682).

2^1808623 is an apocalyptic number.

1808623 is a deficient number, since it is larger than the sum of its proper divisors (42105).

1808623 is an equidigital number, since it uses as much as digits as its factorization.

1808623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42104.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1808623 is about 1344.8505493177. The cubic root of 1808623 is about 121.8379780603.

The spelling of 1808623 in words is "one million, eight hundred eight thousand, six hundred twenty-three".