243940428 has 18 divisors (see below), whose sum is σ = 616627284. Its totient is φ = 81313464.

The previous prime is 243940427. The next prime is 243940439. The reversal of 243940428 is 824049342.

243940428 is a `hidden beast` number, since 243 + 9 + 404 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 6776123 = 243940428 / (2 + 4 + 3 + 9 + 4 + 0 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 243940392 and 243940401.

It is not an unprimeable number, because it can be changed into a prime (243940427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3388026 + ... + 3388097.

Almost surely, 2^243940428 is an apocalyptic number.

It is an amenable number.

243940428 is an abundant number, since it is smaller than the sum of its proper divisors (372686856).

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

243940428 is a wasteful number, since it uses less digits than its factorization.

243940428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6776133 (or 6776128 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 243940428 is about 15618.5923821579. The cubic root of 243940428 is about 624.8291185102.

The spelling of 243940428 in words is "two hundred forty-three million, nine hundred forty thousand, four hundred twenty-eight".