243138444 has 24 divisors (see below), whose sum is σ = 575792448. Its totient is φ = 79836240.

The previous prime is 243138443. The next prime is 243138463. The reversal of 243138444 is 444831342.

It is a super-2 number, since 2×243138444² = 118232605901482272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243138443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150402 + ... + 152009.

It is an arithmetic number, because the mean of its divisors is an integer number (23991352).

Almost surely, 2^243138444 is an apocalyptic number.

It is an amenable number.

243138444 is an abundant number, since it is smaller than the sum of its proper divisors (332654004).

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

243138444 is a wasteful number, since it uses less digits than its factorization.

243138444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302485 (or 302483 counting only the distinct ones).

The product of its digits is 36864, while the sum is 33.

The square root of 243138444 is about 15592.8972291874. The cubic root of 243138444 is about 624.1436326987.

Adding to 243138444 its reverse (444831342), we get a palindrome (687969786).

The spelling of 243138444 in words is "two hundred forty-three million, one hundred thirty-eight thousand, four hundred forty-four".