30840447 has 32 divisors (see below), whose sum is σ = 47278080. Its totient is φ = 17700320.

The previous prime is 30840389. The next prime is 30840449. The reversal of 30840447 is 74404803.

It is not a de Polignac number, because 30840447 - 2¹¹ = 30838399 is a prime.

It is a super-2 number, since 2×30840447² = 1902266342319618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30840449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135748 + ... + 135974.

It is an arithmetic number, because the mean of its divisors is an integer number (1477440).

Almost surely, 2^30840447 is an apocalyptic number.

30840447 is a deficient number, since it is larger than the sum of its proper divisors (16437633).

30840447 is a wasteful number, since it uses less digits than its factorization.

30840447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443.

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 30840447 is about 5553.4175963995. The cubic root of 30840447 is about 313.5981952674.

It can be divided in two parts, 308 and 40447, that added together give a triangular number (40755 = T₂₈₅).

The spelling of 30840447 in words is "thirty million, eight hundred forty thousand, four hundred forty-seven".