30638749 has 2 divisors, whose sum is σ = 30638750. Its totient is φ = 30638748.

The previous prime is 30638731. The next prime is 30638753. The reversal of 30638749 is 94783603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23213124 + 7425625 = 4818^2 + 2725^2 .

It is a cyclic number.

It is not a de Polignac number, because 30638749 - 2¹³ = 30630557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30638719) 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, 15319374 + 15319375.

It is an arithmetic number, because the mean of its divisors is an integer number (15319375).

Almost surely, 2^30638749 is an apocalyptic number.

It is an amenable number.

30638749 is a deficient number, since it is larger than the sum of its proper divisors (1).

30638749 is an equidigital number, since it uses as much as digits as its factorization.

30638749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 30638749 is about 5535.2279989175. The cubic root of 30638749 is about 312.9130503921.

The spelling of 30638749 in words is "thirty million, six hundred thirty-eight thousand, seven hundred forty-nine".