30707993 has 4 divisors (see below), whose sum is σ = 30725328. Its totient is φ = 30690660.

The previous prime is 30707983. The next prime is 30708017. The reversal of 30707993 is 39970703.

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: 39970703 = 541 ⋅73883.

It is a cyclic number.

It is not a de Polignac number, because 30707993 - 2²⁰ = 29659417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30707923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5663 + ... + 9668.

It is an arithmetic number, because the mean of its divisors is an integer number (7681332).

Almost surely, 2^30707993 is an apocalyptic number.

It is an amenable number.

30707993 is a deficient number, since it is larger than the sum of its proper divisors (17335).

30707993 is a wasteful number, since it uses less digits than its factorization.

30707993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17334.

The product of its (nonzero) digits is 35721, while the sum is 38.

The square root of 30707993 is about 5541.4793151288. The cubic root of 30707993 is about 313.1486023168.

The spelling of 30707993 in words is "thirty million, seven hundred seven thousand, nine hundred ninety-three".