39719971 has 2 divisors, whose sum is σ = 39719972. Its totient is φ = 39719970.

The previous prime is 39719969. The next prime is 39720001. The reversal of 39719971 is 17991793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39719971 - 2¹ = 39719969 is a prime.

Together with 39719969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (39719941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19859985 + 19859986.

It is an arithmetic number, because the mean of its divisors is an integer number (19859986).

Almost surely, 2^39719971 is an apocalyptic number.

39719971 is a deficient number, since it is larger than the sum of its proper divisors (1).

39719971 is an equidigital number, since it uses as much as digits as its factorization.

39719971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107163, while the sum is 46.

The square root of 39719971 is about 6302.3782019171. The cubic root of 39719971 is about 341.1952482746.

The spelling of 39719971 in words is "thirty-nine million, seven hundred nineteen thousand, nine hundred seventy-one".