243936005 has 16 divisors (see below), whose sum is σ = 303417840. Its totient is φ = 188116992.

The previous prime is 243935983. The next prime is 243936013. The reversal of 243936005 is 500639342.

It can be written as a sum of positive squares in 8 ways, for example, as 638401 + 243297604 = 799^2 + 15598^2 .

It is a cyclic number.

It is not a de Polignac number, because 243936005 - 2⁸ = 243935749 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14117 + ... + 26213.

It is an arithmetic number, because the mean of its divisors is an integer number (18963615).

Almost surely, 2^243936005 is an apocalyptic number.

It is an amenable number.

243936005 is a deficient number, since it is larger than the sum of its proper divisors (59481835).

243936005 is a wasteful number, since it uses less digits than its factorization.

243936005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12248.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 243936005 is about 15618.4507874501. The cubic root of 243936005 is about 624.8253421293.

The spelling of 243936005 in words is "two hundred forty-three million, nine hundred thirty-six thousand, five".