30806838 has 16 divisors (see below), whose sum is σ = 68459760. Its totient is φ = 10268928.

The previous prime is 30806819. The next prime is 30806843. The reversal of 30806838 is 83860803.

It is a super-2 number, since 2×30806838² = 1898122535116488, which contains 22 as substring.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 285195 + ... + 285302.

It is an arithmetic number, because the mean of its divisors is an integer number (4278735).

Almost surely, 2^30806838 is an apocalyptic number.

30806838 is an abundant number, since it is smaller than the sum of its proper divisors (37652922).

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

30806838 is a wasteful number, since it uses less digits than its factorization.

30806838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570508 (or 570502 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 30806838 is about 5550.3907970520. The cubic root of 30806838 is about 313.4842372057.

The spelling of 30806838 in words is "thirty million, eight hundred six thousand, eight hundred thirty-eight".