309059985 has 32 divisors (see below), whose sum is σ = 560568960. Its totient is φ = 144142848.

The previous prime is 309059981. The next prime is 309059999. The reversal of 309059985 is 589950903.

It is not a de Polignac number, because 309059985 - 2² = 309059981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (309059981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38004 + ... + 45413.

It is an arithmetic number, because the mean of its divisors is an integer number (17517780).

Almost surely, 2^309059985 is an apocalyptic number.

It is an amenable number.

309059985 is a deficient number, since it is larger than the sum of its proper divisors (251508975).

309059985 is a wasteful number, since it uses less digits than its factorization.

309059985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83457.

The product of its (nonzero) digits is 437400, while the sum is 48.

The square root of 309059985 is about 17580.1019621617. The cubic root of 309059985 is about 676.1051744262.

The spelling of 309059985 in words is "three hundred nine million, fifty-nine thousand, nine hundred eighty-five".