30478939 has 2 divisors, whose sum is σ = 30478940. Its totient is φ = 30478938.

The previous prime is 30478937. The next prime is 30478957. The reversal of 30478939 is 93987403.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30478939 - 2¹ = 30478937 is a prime.

Together with 30478937, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 30478895 and 30478904.

It is not a weakly prime, because it can be changed into another prime (30478937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15239469 + 15239470.

It is an arithmetic number, because the mean of its divisors is an integer number (15239470).

Almost surely, 2^30478939 is an apocalyptic number.

30478939 is a deficient number, since it is larger than the sum of its proper divisors (1).

30478939 is an equidigital number, since it uses as much as digits as its factorization.

30478939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 30478939 is about 5520.7734059641. The cubic root of 30478939 is about 312.3680560851.

The spelling of 30478939 in words is "thirty million, four hundred seventy-eight thousand, nine hundred thirty-nine".