243445725 has 18 divisors (see below), whose sum is σ = 436038746. Its totient is φ = 129837600.

The previous prime is 243445721. The next prime is 243445733. The reversal of 243445725 is 527544342.

243445725 is a `hidden beast` number, since 2 + 43 + 44 + 572 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 4372281 + 239073444 = 2091^2 + 15462^2 .

It is not a de Polignac number, because 243445725 - 2² = 243445721 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243445725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243445721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 540766 + ... + 541215.

Almost surely, 2^243445725 is an apocalyptic number.

243445725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243445725 is a deficient number, since it is larger than the sum of its proper divisors (192593021).

243445725 is a wasteful number, since it uses less digits than its factorization.

243445725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081997 (or 1081989 counting only the distinct ones).

The product of its digits is 134400, while the sum is 36.

The square root of 243445725 is about 15602.7473542322. The cubic root of 243445725 is about 624.4064551724.

The spelling of 243445725 in words is "two hundred forty-three million, four hundred forty-five thousand, seven hundred twenty-five".