243138454 has 64 divisors (see below), whose sum is σ = 432081216. Its totient is φ = 101597184.

The previous prime is 243138443. The next prime is 243138463. The reversal of 243138454 is 454831342.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2272269 + ... + 2272375.

It is an arithmetic number, because the mean of its divisors is an integer number (6751269).

Almost surely, 2^243138454 is an apocalyptic number.

243138454 is a deficient number, since it is larger than the sum of its proper divisors (188942762).

243138454 is a wasteful number, since it uses less digits than its factorization.

243138454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289.

The product of its digits is 46080, while the sum is 34.

The square root of 243138454 is about 15592.8975498462. The cubic root of 243138454 is about 624.1436412554.

Adding to 243138454 its reverse (454831342), we get a palindrome (697969796).

The spelling of 243138454 in words is "two hundred forty-three million, one hundred thirty-eight thousand, four hundred fifty-four".