30388947 has 4 divisors (see below), whose sum is σ = 40518600. Its totient is φ = 20259296.

The previous prime is 30388937. The next prime is 30388973. The reversal of 30388947 is 74988303.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 30388947 - 2¹⁰ = 30387923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30388899 and 30388908.

It is not an unprimeable number, because it can be changed into a prime (30388907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5064822 + ... + 5064827.

It is an arithmetic number, because the mean of its divisors is an integer number (10129650).

Almost surely, 2^30388947 is an apocalyptic number.

30388947 is a deficient number, since it is larger than the sum of its proper divisors (10129653).

30388947 is a wasteful number, since it uses less digits than its factorization.

30388947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10129652.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 30388947 is about 5512.6170735867. The cubic root of 30388947 is about 312.0603207664.

The spelling of 30388947 in words is "thirty million, three hundred eighty-eight thousand, nine hundred forty-seven".