243390420 has 360 divisors, whose sum is σ = 952326144. Its totient is φ = 50948352.

The previous prime is 243390397. The next prime is 243390421. The reversal of 243390420 is 24093342.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243390421) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1916397 + ... + 1916523.

Almost surely, 2^243390420 is an apocalyptic number.

243390420 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 243390420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (476163072).

243390420 is an abundant number, since it is smaller than the sum of its proper divisors (708935724).

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

243390420 is a wasteful number, since it uses less digits than its factorization.

243390420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 243390420 is about 15600.9749695332. The cubic root of 243390420 is about 624.3591682267.

The spelling of 243390420 in words is "two hundred forty-three million, three hundred ninety thousand, four hundred twenty".