243138464 has 12 divisors (see below), whose sum is σ = 478678914. Its totient is φ = 121569216.

The previous prime is 243138463. The next prime is 243138479. The reversal of 243138464 is 464831342.

It can be written as a sum of positive squares in only one way, i.e., 203347600 + 39790864 = 14260^2 + 6308^2 .

It is not an unprimeable number, because it can be changed into a prime (243138463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3799007 + ... + 3799070.

Almost surely, 2^243138464 is an apocalyptic number.

It is an amenable number.

243138464 is a deficient number, since it is larger than the sum of its proper divisors (235540450).

243138464 is an equidigital number, since it uses as much as digits as its factorization.

243138464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7598087 (or 7598079 counting only the distinct ones).

The product of its digits is 55296, while the sum is 35.

The square root of 243138464 is about 15592.8978705050. The cubic root of 243138464 is about 624.1436498122.

The spelling of 243138464 in words is "two hundred forty-three million, one hundred thirty-eight thousand, four hundred sixty-four".