30181806 has 12 divisors (see below), whose sum is σ = 65393952. Its totient is φ = 10060596.

The previous prime is 30181799. The next prime is 30181831. The reversal of 30181806 is 60818103.

It is a self number, because there is not a number n which added to its sum of digits gives 30181806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 838366 + ... + 838401.

It is an arithmetic number, because the mean of its divisors is an integer number (5449496).

Almost surely, 2^30181806 is an apocalyptic number.

30181806 is an abundant number, since it is smaller than the sum of its proper divisors (35212146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30181806 is a wasteful number, since it uses less digits than its factorization.

30181806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676775 (or 1676772 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 30181806 is about 5493.7970475801. The cubic root of 30181806 is about 311.3496685694.

Adding to 30181806 its reverse (60818103), we get a palindrome (90999909).

The spelling of 30181806 in words is "thirty million, one hundred eighty-one thousand, eight hundred six".