30188729 has 2 divisors, whose sum is σ = 30188730. Its totient is φ = 30188728.

The previous prime is 30188723. The next prime is 30188731. The reversal of 30188729 is 92788103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22543504 + 7645225 = 4748^2 + 2765^2 .

It is a cyclic number.

It is not a de Polignac number, because 30188729 - 2¹² = 30184633 is a prime.

It is a super-2 number, since 2×30188729² = 1822718717270882, which contains 22 as substring.

Together with 30188731, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 30188692 and 30188701.

It is not a weakly prime, because it can be changed into another prime (30188723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15094364 + 15094365.

It is an arithmetic number, because the mean of its divisors is an integer number (15094365).

Almost surely, 2^30188729 is an apocalyptic number.

It is an amenable number.

30188729 is a deficient number, since it is larger than the sum of its proper divisors (1).

30188729 is an equidigital number, since it uses as much as digits as its factorization.

30188729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 30188729 is about 5494.4270856933. The cubic root of 30188729 is about 311.3734721921.

The spelling of 30188729 in words is "thirty million, one hundred eighty-eight thousand, seven hundred twenty-nine".