243155420 has 48 divisors (see below), whose sum is σ = 553881888. Its totient is φ = 89303040.

The previous prime is 243155417. The next prime is 243155431. The reversal of 243155420 is 24551342.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 243155420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5219 + ... + 22661.

It is an arithmetic number, because the mean of its divisors is an integer number (11539206).

Almost surely, 2^243155420 is an apocalyptic number.

243155420 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 243155420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276940944).

243155420 is an abundant number, since it is smaller than the sum of its proper divisors (310726468).

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

243155420 is a wasteful number, since it uses less digits than its factorization.

243155420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17510 (or 17508 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 243155420 is about 15593.4415700961. The cubic root of 243155420 is about 624.1581583266.

The spelling of 243155420 in words is "two hundred forty-three million, one hundred fifty-five thousand, four hundred twenty".