30856881 has 16 divisors (see below), whose sum is σ = 45501120. Its totient is φ = 18443520.

The previous prime is 30856867. The next prime is 30856897. The reversal of 30856881 is 18865803.

It is a happy number.

It is not a de Polignac number, because 30856881 - 2⁵ = 30856849 is a prime.

It is a super-2 number, since 2×30856881² = 1904294210096322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30856801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3996 + ... + 8813.

It is an arithmetic number, because the mean of its divisors is an integer number (2843820).

Almost surely, 2^30856881 is an apocalyptic number.

It is an amenable number.

30856881 is a deficient number, since it is larger than the sum of its proper divisors (14644239).

30856881 is a wasteful number, since it uses less digits than its factorization.

30856881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12896.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 30856881 is about 5554.8970287486. The cubic root of 30856881 is about 313.6538879059.

The spelling of 30856881 in words is "thirty million, eight hundred fifty-six thousand, eight hundred eighty-one".