30909793 has 2 divisors, whose sum is σ = 30909794. Its totient is φ = 30909792.

The previous prime is 30909743. The next prime is 30909797. The reversal of 30909793 is 39790903.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30835809 + 73984 = 5553^2 + 272^2 .

It is an emirp because it is prime and its reverse (39790903) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30909793 is a prime.

It is not a weakly prime, because it can be changed into another prime (30909797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15454896 + 15454897.

It is an arithmetic number, because the mean of its divisors is an integer number (15454897).

Almost surely, 2^30909793 is an apocalyptic number.

It is an amenable number.

30909793 is a deficient number, since it is larger than the sum of its proper divisors (1).

30909793 is an equidigital number, since it uses as much as digits as its factorization.

30909793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45927, while the sum is 40.

The square root of 30909793 is about 5559.6576333440. The cubic root of 30909793 is about 313.8330654178.

The spelling of 30909793 in words is "thirty million, nine hundred nine thousand, seven hundred ninety-three".