30978427 has 2 divisors, whose sum is σ = 30978428. Its totient is φ = 30978426.

The previous prime is 30978421. The next prime is 30978439. The reversal of 30978427 is 72487903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30978427 - 2¹⁵ = 30945659 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30978427.

It is not a weakly prime, because it can be changed into another prime (30978421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15489213 + 15489214.

It is an arithmetic number, because the mean of its divisors is an integer number (15489214).

Almost surely, 2^30978427 is an apocalyptic number.

30978427 is a deficient number, since it is larger than the sum of its proper divisors (1).

30978427 is an equidigital number, since it uses as much as digits as its factorization.

30978427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 30978427 is about 5565.8267130769. The cubic root of 30978427 is about 314.0651784315.

The spelling of 30978427 in words is "thirty million, nine hundred seventy-eight thousand, four hundred twenty-seven".