30847985 has 32 divisors (see below), whose sum is σ = 43929600. Its totient is φ = 20357568.

The previous prime is 30847907. The next prime is 30847987. The reversal of 30847985 is 58974803.

It is not a de Polignac number, because 30847985 - 2¹⁰ = 30846961 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30847987) 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, 154916 + ... + 155114.

It is an arithmetic number, because the mean of its divisors is an integer number (1372800).

Almost surely, 2^30847985 is an apocalyptic number.

30847985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

30847985 is a deficient number, since it is larger than the sum of its proper divisors (13081615).

30847985 is a wasteful number, since it uses less digits than its factorization.

30847985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 30847985 is about 5554.0962361126. The cubic root of 30847985 is about 313.6237430016.

It can be divided in two parts, 3084798 and 5, that added together give a palindrome (3084803).

The spelling of 30847985 in words is "thirty million, eight hundred forty-seven thousand, nine hundred eighty-five".