30839381 has 4 divisors (see below), whose sum is σ = 30885612. Its totient is φ = 30793152.

The previous prime is 30839371. The next prime is 30839399. The reversal of 30839381 is 18393803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18393803 = 443 ⋅41521.

It can be written as a sum of positive squares in 2 ways, for example, as 28408900 + 2430481 = 5330^2 + 1559^2 .

It is a cyclic number.

It is not a de Polignac number, because 30839381 - 2⁶ = 30839317 is a prime.

It is a super-2 number, since 2×30839381² = 1902134840926322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30839321) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 22100 + ... + 23453.

It is an arithmetic number, because the mean of its divisors is an integer number (7721403).

Almost surely, 2^30839381 is an apocalyptic number.

It is an amenable number.

30839381 is a deficient number, since it is larger than the sum of its proper divisors (46231).

30839381 is an equidigital number, since it uses as much as digits as its factorization.

30839381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46230.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 30839381 is about 5553.3216186351. The cubic root of 30839381 is about 313.5945820521.

The spelling of 30839381 in words is "thirty million, eight hundred thirty-nine thousand, three hundred eighty-one".