30391933 has 18 divisors (see below), whose sum is σ = 36236382. Its totient is φ = 25320240.

The previous prime is 30391931. The next prime is 30391951. The reversal of 30391933 is 33919303.

It can be written as a sum of positive squares in only one way, i.e., 21040569 + 9351364 = 4587^2 + 3058^2 .

It is not a de Polignac number, because 30391933 - 2¹ = 30391931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30391895 and 30391904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30391931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 218578 + ... + 218716.

Almost surely, 2^30391933 is an apocalyptic number.

It is an amenable number.

30391933 is a deficient number, since it is larger than the sum of its proper divisors (5844449).

30391933 is a wasteful number, since it uses less digits than its factorization.

30391933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 31.

The square root of 30391933 is about 5512.8879001844. The cubic root of 30391933 is about 312.0705413860.

The spelling of 30391933 in words is "thirty million, three hundred ninety-one thousand, nine hundred thirty-three".