623844 has 72 divisors (see below), whose sum is σ = 1793792. Its totient is φ = 181440.

The previous prime is 623839. The next prime is 623851. The reversal of 623844 is 448326.

It is an unprimeable number.

623844 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14487 + ... + 14529.

2⁶²³⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 623844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (896896).

623844 is an abundant number, since it is smaller than the sum of its proper divisors (1169948).

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

623844 is a wasteful number, since it uses less digits than its factorization.

623844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 92 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 623844 is about 789.8379580648. The cubic root of 623844 is about 85.4460519426.

It can be divided in two parts, 6238 and 44, that multiplied together give a palindrome (274472).

The spelling of 623844 in words is "six hundred twenty-three thousand, eight hundred forty-four".