30509985 has 64 divisors (see below), whose sum is σ = 57542400. Its totient is φ = 13639680.

The previous prime is 30509977. The next prime is 30509987. The reversal of 30509985 is 58990503.

It is not a de Polignac number, because 30509985 - 2³ = 30509977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30509987) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 204691 + ... + 204839.

It is an arithmetic number, because the mean of its divisors is an integer number (899100).

Almost surely, 2^30509985 is an apocalyptic number.

It is an amenable number.

30509985 is a deficient number, since it is larger than the sum of its proper divisors (27032415).

30509985 is a wasteful number, since it uses less digits than its factorization.

30509985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 30509985 is about 5523.5844340428. The cubic root of 30509985 is about 312.4740799835.

It can be divided in two parts, 30 and 509985, that added together give a palindrome (510015).

The spelling of 30509985 in words is "thirty million, five hundred nine thousand, nine hundred eighty-five".