30186749 has 2 divisors, whose sum is σ = 30186750. Its totient is φ = 30186748.

The previous prime is 30186721. The next prime is 30186791. The reversal of 30186749 is 94768103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21921124 + 8265625 = 4682^2 + 2875^2 .

It is an emirp because it is prime and its reverse (94768103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30186749 - 2⁸ = 30186493 is a prime.

It is a super-2 number, since 2×30186749² = 1822479630378002, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30186799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15093374 + 15093375.

It is an arithmetic number, because the mean of its divisors is an integer number (15093375).

Almost surely, 2^30186749 is an apocalyptic number.

It is an amenable number.

30186749 is a deficient number, since it is larger than the sum of its proper divisors (1).

30186749 is an equidigital number, since it uses as much as digits as its factorization.

30186749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 30186749 is about 5494.2469001675. The cubic root of 30186749 is about 311.3666646520.

The spelling of 30186749 in words is "thirty million, one hundred eighty-six thousand, seven hundred forty-nine".