243321000 has 256 divisors, whose sum is σ = 868008960. Its totient is φ = 56217600.

The previous prime is 243320999. The next prime is 243321031. The reversal of 243321000 is 123342.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 662817 + ... + 663183.

It is an arithmetic number, because the mean of its divisors is an integer number (3390660).

Almost surely, 2^243321000 is an apocalyptic number.

243321000 is a gapful number since it is divisible by the number (20) 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 243321000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (434004480).

243321000 is an abundant number, since it is smaller than the sum of its proper divisors (624687960).

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

243321000 is a wasteful number, since it uses less digits than its factorization.

243321000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 407 counting only the distinct ones).

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

The square root of 243321000 is about 15598.7499499159. The cubic root of 243321000 is about 624.2998025172.

Adding to 243321000 its reverse (123342), we get a palindrome (243444342).

The spelling of 243321000 in words is "two hundred forty-three million, three hundred twenty-one thousand".