39930749 has 2 divisors, whose sum is σ = 39930750. Its totient is φ = 39930748.

The previous prime is 39930721. The next prime is 39930763. The reversal of 39930749 is 94703993.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31416025 + 8514724 = 5605^2 + 2918^2 .

It is an emirp because it is prime and its reverse (94703993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39930749 - 2¹⁶ = 39865213 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39930949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19965374 + 19965375.

It is an arithmetic number, because the mean of its divisors is an integer number (19965375).

Almost surely, 2^39930749 is an apocalyptic number.

It is an amenable number.

39930749 is a deficient number, since it is larger than the sum of its proper divisors (1).

39930749 is an equidigital number, since it uses as much as digits as its factorization.

39930749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 39930749 is about 6319.0781764431. The cubic root of 39930749 is about 341.7977127556.

The spelling of 39930749 in words is "thirty-nine million, nine hundred thirty thousand, seven hundred forty-nine".