30878047 has 2 divisors, whose sum is σ = 30878048. Its totient is φ = 30878046.

The previous prime is 30878039. The next prime is 30878053. The reversal of 30878047 is 74087803.

It is a strong prime.

It is an emirp because it is prime and its reverse (74087803) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30878047 - 2³ = 30878039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30877997 and 30878015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30878027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15439023 + 15439024.

It is an arithmetic number, because the mean of its divisors is an integer number (15439024).

Almost surely, 2^30878047 is an apocalyptic number.

30878047 is a deficient number, since it is larger than the sum of its proper divisors (1).

30878047 is an equidigital number, since it uses as much as digits as its factorization.

30878047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 30878047 is about 5556.8018679813. The cubic root of 30878047 is about 313.7255875356.

The spelling of 30878047 in words is "thirty million, eight hundred seventy-eight thousand, forty-seven".