243974394 has 12 divisors (see below), whose sum is σ = 528611226. Its totient is φ = 81324792.

The previous prime is 243974387. The next prime is 243974399. The reversal of 243974394 is 493479342.

243974394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 241398369 + 2576025 = 15537^2 + 1605^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243974399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6777049 + ... + 6777084.

Almost surely, 2^243974394 is an apocalyptic number.

243974394 is an abundant number, since it is smaller than the sum of its proper divisors (284636832).

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

243974394 is a wasteful number, since it uses less digits than its factorization.

243974394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13554141 (or 13554138 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

The square root of 243974394 is about 15619.6797022218. The cubic root of 243974394 is about 624.8581173400.

The spelling of 243974394 in words is "two hundred forty-three million, nine hundred seventy-four thousand, three hundred ninety-four".