39730991 has 2 divisors, whose sum is σ = 39730992. Its totient is φ = 39730990.

The previous prime is 39730967. The next prime is 39730993. The reversal of 39730991 is 19903793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39730991 - 2¹⁴ = 39714607 is a prime.

Together with 39730993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39730993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19865495 + 19865496.

It is an arithmetic number, because the mean of its divisors is an integer number (19865496).

Almost surely, 2^39730991 is an apocalyptic number.

39730991 is a deficient number, since it is larger than the sum of its proper divisors (1).

39730991 is an equidigital number, since it uses as much as digits as its factorization.

39730991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45927, while the sum is 41.

The square root of 39730991 is about 6303.2524144286. The cubic root of 39730991 is about 341.2267993548.

The spelling of 39730991 in words is "thirty-nine million, seven hundred thirty thousand, nine hundred ninety-one".