623400 has 48 divisors (see below), whose sum is σ = 1934400. Its totient is φ = 166080.

The previous prime is 623393. The next prime is 623401. The reversal of 623400 is 4326.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 623400.

It is not an unprimeable number, because it can be changed into a prime (623401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81 + ... + 1119.

It is an arithmetic number, because the mean of its divisors is an integer number (40300).

2⁶²³⁴⁰⁰ is an apocalyptic number.

623400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 623400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (967200).

623400 is an abundant number, since it is smaller than the sum of its proper divisors (1311000).

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

623400 is a wasteful number, since it uses less digits than its factorization.

623400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058 (or 1049 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 623400 is about 789.5568377261. The cubic root of 623400 is about 85.4257760131.

Adding to 623400 its reverse (4326), we get a palindrome (627726).

The spelling of 623400 in words is "six hundred twenty-three thousand, four hundred".