243921394 has 16 divisors (see below), whose sum is σ = 382180032. Its totient is φ = 116538928.

The previous prime is 243921347. The next prime is 243921437. The reversal of 243921394 is 493129342.

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, 56952 + ... + 61084.

It is an arithmetic number, because the mean of its divisors is an integer number (23886252).

Almost surely, 2^243921394 is an apocalyptic number.

243921394 is a deficient number, since it is larger than the sum of its proper divisors (138258638).

243921394 is a wasteful number, since it uses less digits than its factorization.

243921394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5441.

The product of its digits is 46656, while the sum is 37.

The square root of 243921394 is about 15617.9830323893. The cubic root of 243921394 is about 624.8128668555.

The spelling of 243921394 in words is "two hundred forty-three million, nine hundred twenty-one thousand, three hundred ninety-four".