243987445 has 8 divisors (see below), whose sum is σ = 315306936. Its totient is φ = 180175296.

The previous prime is 243987439. The next prime is 243987449. The reversal of 243987445 is 544789342.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3334276 + 240653169 = 1826^2 + 15513^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243987445 - 2³ = 243987437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243987395 and 243987404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243987449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1876762 + ... + 1876891.

It is an arithmetic number, because the mean of its divisors is an integer number (39413367).

Almost surely, 2^243987445 is an apocalyptic number.

It is an amenable number.

243987445 is a deficient number, since it is larger than the sum of its proper divisors (71319491).

243987445 is a wasteful number, since it uses less digits than its factorization.

243987445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753671.

The product of its digits is 967680, while the sum is 46.

The square root of 243987445 is about 15620.0974708867. The cubic root of 243987445 is about 624.8692590528.

The spelling of 243987445 in words is "two hundred forty-three million, nine hundred eighty-seven thousand, four hundred forty-five".