243919894 has 4 divisors (see below), whose sum is σ = 365879844. Its totient is φ = 121959946.

The previous prime is 243919889. The next prime is 243919903. The reversal of 243919894 is 498919342.

243919894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 498919342 = 2 ⋅249459671.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60979972 + ... + 60979975.

It is an arithmetic number, because the mean of its divisors is an integer number (91469961).

Almost surely, 2^243919894 is an apocalyptic number.

243919894 is a deficient number, since it is larger than the sum of its proper divisors (121959950).

243919894 is a wasteful number, since it uses less digits than its factorization.

243919894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121959949.

The product of its digits is 559872, while the sum is 49.

The square root of 243919894 is about 15617.9350107497. The cubic root of 243919894 is about 624.8115860860.

The spelling of 243919894 in words is "two hundred forty-three million, nine hundred nineteen thousand, eight hundred ninety-four".