235280309 has 4 divisors (see below), whose sum is σ = 256669440. Its totient is φ = 213891180.

The previous prime is 235280293. The next prime is 235280333. The reversal of 235280309 is 903082532.

235280309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 235280309 - 2⁴ = 235280293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (235280369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10694549 + ... + 10694570.

It is an arithmetic number, because the mean of its divisors is an integer number (64167360).

Almost surely, 2^235280309 is an apocalyptic number.

It is an amenable number.

235280309 is a deficient number, since it is larger than the sum of its proper divisors (21389131).

235280309 is a wasteful number, since it uses less digits than its factorization.

235280309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21389130.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 235280309 is about 15338.8496635178. The cubic root of 235280309 is about 617.3458418524.

The spelling of 235280309 in words is "two hundred thirty-five million, two hundred eighty thousand, three hundred nine".