30840081 has 4 divisors (see below), whose sum is σ = 41120112. Its totient is φ = 20560052.

The previous prime is 30840053. The next prime is 30840101. The reversal of 30840081 is 18004803.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18004803 = 3 ⋅6001601.

It is a cyclic number.

It is not a de Polignac number, because 30840081 - 2¹¹ = 30838033 is a prime.

It is a super-2 number, since 2×30840081² = 1902221192173122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30840041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5140011 + ... + 5140016.

It is an arithmetic number, because the mean of its divisors is an integer number (10280028).

Almost surely, 2^30840081 is an apocalyptic number.

It is an amenable number.

30840081 is a deficient number, since it is larger than the sum of its proper divisors (10280031).

30840081 is a wasteful number, since it uses less digits than its factorization.

30840081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10280030.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 30840081 is about 5553.3846436205. The cubic root of 30840081 is about 313.5969547169.

Adding to 30840081 its reverse (18004803), we get a palindrome (48844884).

The spelling of 30840081 in words is "thirty million, eight hundred forty thousand, eighty-one".