309240236 has 12 divisors (see below), whose sum is σ = 545121528. Its totient is φ = 153491232.

The previous prime is 309240227. The next prime is 309240247. The reversal of 309240236 is 632042903.

It is a super-3 number, since 3×309240236³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 309240199 and 309240208.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281606 + ... + 282701.

It is an arithmetic number, because the mean of its divisors is an integer number (45426794).

Almost surely, 2^309240236 is an apocalyptic number.

It is an amenable number.

309240236 is a deficient number, since it is larger than the sum of its proper divisors (235881292).

309240236 is a wasteful number, since it uses less digits than its factorization.

309240236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564448 (or 564446 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 309240236 is about 17585.2277778822. The cubic root of 309240236 is about 676.2365889899.

The spelling of 309240236 in words is "three hundred nine million, two hundred forty thousand, two hundred thirty-six".