30477993 has 16 divisors (see below), whose sum is σ = 50015616. Its totient is φ = 16076160.

The previous prime is 30477989. The next prime is 30478027. The reversal of 30477993 is 39977403.

It is not a de Polignac number, because 30477993 - 2² = 30477989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30477193) 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, 55548 + ... + 56093.

It is an arithmetic number, because the mean of its divisors is an integer number (3125976).

Almost surely, 2^30477993 is an apocalyptic number.

It is an amenable number.

30477993 is a deficient number, since it is larger than the sum of its proper divisors (19537623).

30477993 is a wasteful number, since it uses less digits than its factorization.

30477993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111664.

The product of its (nonzero) digits is 142884, while the sum is 42.

The square root of 30477993 is about 5520.6877288976. The cubic root of 30477993 is about 312.3648243099.

The spelling of 30477993 in words is "thirty million, four hundred seventy-seven thousand, nine hundred ninety-three".