243990900 has 144 divisors (see below), whose sum is σ = 818697600. Its totient is φ = 62219520.

The previous prime is 243990899. The next prime is 243990961. The reversal of 243990900 is 9099342.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60136 + ... + 64064.

It is an arithmetic number, because the mean of its divisors is an integer number (5685400).

Almost surely, 2^243990900 is an apocalyptic number.

243990900 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 243990900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (409348800).

243990900 is an abundant number, since it is smaller than the sum of its proper divisors (574706700).

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

243990900 is a wasteful number, since it uses less digits than its factorization.

243990900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3975 (or 3962 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 243990900 is about 15620.2080651955. The cubic root of 243990900 is about 624.8722085394.

It can be divided in two parts, 2439 and 90900, that added together give a palindrome (93339).

The spelling of 243990900 in words is "two hundred forty-three million, nine hundred ninety thousand, nine hundred".