30855993 has 16 divisors (see below), whose sum is σ = 47139840. Its totient is φ = 17586576.

The previous prime is 30855977. The next prime is 30856043. The reversal of 30855993 is 39955803.

It is not a de Polignac number, because 30855993 - 2⁴ = 30855977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30855973) 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, 7546 + ... + 10892.

It is an arithmetic number, because the mean of its divisors is an integer number (2946240).

Almost surely, 2^30855993 is an apocalyptic number.

It is an amenable number.

30855993 is a deficient number, since it is larger than the sum of its proper divisors (16283847).

30855993 is a wasteful number, since it uses less digits than its factorization.

30855993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3796.

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 30855993 is about 5554.8170986991. The cubic root of 30855993 is about 313.6508790975.

The spelling of 30855993 in words is "thirty million, eight hundred fifty-five thousand, nine hundred ninety-three".