306985 has 16 divisors (see below), whose sum is σ = 432000. Its totient is φ = 209328.

The previous prime is 306953. The next prime is 306991. The reversal of 306985 is 589603.

It is not a de Polignac number, because 306985 - 2⁵ = 306953 is a prime.

It is a nialpdrome in base 13.

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, 1626 + ... + 1804.

It is an arithmetic number, because the mean of its divisors is an integer number (27000).

2³⁰⁶⁹⁸⁵ is an apocalyptic number.

306985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

306985 is a deficient number, since it is larger than the sum of its proper divisors (125015).

306985 is an equidigital number, since it uses as much as digits as its factorization.

306985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 306985 is about 554.0622708685. The cubic root of 306985 is about 67.4588684026.

It can be divided in two parts, 30698 and 5, that added together give a palindrome (30703).

The spelling of 306985 in words is "three hundred six thousand, nine hundred eighty-five".