243321408 has 280 divisors, whose sum is σ = 836456544. Its totient is φ = 69120000.

The previous prime is 243321401. The next prime is 243321409. The reversal of 243321408 is 804123342.

It is a super-2 number, since 2×243321408² = 118410615182204928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (243321401) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 969283 + ... + 969533.

Almost surely, 2^243321408 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 243321408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (418228272).

243321408 is an abundant number, since it is smaller than the sum of its proper divisors (593135136).

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

243321408 is a wasteful number, since it uses less digits than its factorization.

243321408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 284 counting only the distinct ones).

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

The square root of 243321408 is about 15598.7630278814. The cubic root of 243321408 is about 624.3001514584.

The spelling of 243321408 in words is "two hundred forty-three million, three hundred twenty-one thousand, four hundred eight".