30788939 has 2 divisors, whose sum is σ = 30788940. Its totient is φ = 30788938.

The previous prime is 30788897. The next prime is 30788971. The reversal of 30788939 is 93988703.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30788939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30788893 and 30788902.

It is not a weakly prime, because it can be changed into another prime (30785939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15394469 + 15394470.

It is an arithmetic number, because the mean of its divisors is an integer number (15394470).

Almost surely, 2^30788939 is an apocalyptic number.

30788939 is a deficient number, since it is larger than the sum of its proper divisors (1).

30788939 is an equidigital number, since it uses as much as digits as its factorization.

30788939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 30788939 is about 5548.7781537921. The cubic root of 30788939 is about 313.4235132261.

The spelling of 30788939 in words is "thirty million, seven hundred eighty-eight thousand, nine hundred thirty-nine".