30685947 has 4 divisors (see below), whose sum is σ = 40914600. Its totient is φ = 20457296.

The previous prime is 30685909. The next prime is 30685951. The reversal of 30685947 is 74958603.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74958603 = 3 ⋅24986201.

It is a cyclic number.

It is not a de Polignac number, because 30685947 - 2⁶ = 30685883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30685899 and 30685908.

It is not an unprimeable number, because it can be changed into a prime (30685957) 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, 5114322 + ... + 5114327.

It is an arithmetic number, because the mean of its divisors is an integer number (10228650).

Almost surely, 2^30685947 is an apocalyptic number.

30685947 is a deficient number, since it is larger than the sum of its proper divisors (10228653).

30685947 is a wasteful number, since it uses less digits than its factorization.

30685947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10228652.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 30685947 is about 5539.4897779489. The cubic root of 30685947 is about 313.0736454280.

The spelling of 30685947 in words is "thirty million, six hundred eighty-five thousand, nine hundred forty-seven".