243149900 has 72 divisors (see below), whose sum is σ = 609398496. Its totient is φ = 82483200.

The previous prime is 243149899. The next prime is 243149909. The reversal of 243149900 is 9941342.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243149909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66110 + ... + 69690.

It is an arithmetic number, because the mean of its divisors is an integer number (8463868).

Almost surely, 2^243149900 is an apocalyptic number.

243149900 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 243149900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304699248).

243149900 is an abundant number, since it is smaller than the sum of its proper divisors (366248596).

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

243149900 is a wasteful number, since it uses less digits than its factorization.

243149900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3699 (or 3692 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 243149900 is about 15593.2645716027. The cubic root of 243149900 is about 624.1534351759.

The spelling of 243149900 in words is "two hundred forty-three million, one hundred forty-nine thousand, nine hundred".