243999972 has 48 divisors (see below), whose sum is σ = 634677120. Its totient is φ = 81065376.

The previous prime is 243999971. The next prime is 243999991. The reversal of 243999972 is 279999342.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (243999971) 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 15 ways as a sum of consecutive naturals, for example, 30673 + ... + 37799.

It is an arithmetic number, because the mean of its divisors is an integer number (13222440).

Almost surely, 2^243999972 is an apocalyptic number.

It is an amenable number.

243999972 is an abundant number, since it is smaller than the sum of its proper divisors (390677148).

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

243999972 is a wasteful number, since it uses less digits than its factorization.

243999972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7457 (or 7449 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The square root of 243999972 is about 15620.4984555551. The cubic root of 243999972 is about 624.8799530501.

The spelling of 243999972 in words is "two hundred forty-three million, nine hundred ninety-nine thousand, nine hundred seventy-two".