243138455 has 8 divisors (see below), whose sum is σ = 333447072. Its totient is φ = 166723488.

The previous prime is 243138443. The next prime is 243138463. The reversal of 243138455 is 554831342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243138455 - 2²² = 238944151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 6946813 = 243138455 / (2 + 4 + 3 + 1 + 3 + 8 + 4 + 5 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3473372 + ... + 3473441.

It is an arithmetic number, because the mean of its divisors is an integer number (41680884).

Almost surely, 2^243138455 is an apocalyptic number.

243138455 is a deficient number, since it is larger than the sum of its proper divisors (90308617).

243138455 is an equidigital number, since it uses as much as digits as its factorization.

243138455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6946825.

The product of its digits is 57600, while the sum is 35.

The square root of 243138455 is about 15592.8975819121. The cubic root of 243138455 is about 624.1436421111.

Adding to 243138455 its reverse (554831342), we get a palindrome (797969797).

It can be divided in two parts, 24313 and 8455, that added together give a 15-th power (32768 = 2¹⁵).

The spelling of 243138455 in words is "two hundred forty-three million, one hundred thirty-eight thousand, four hundred fifty-five".