39920017 has 2 divisors, whose sum is σ = 39920018. Its totient is φ = 39920016.

The previous prime is 39919991. The next prime is 39920053. The reversal of 39920017 is 71002993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24167056 + 15752961 = 4916^2 + 3969^2 .

It is an emirp because it is prime and its reverse (71002993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39920017 - 2¹⁵ = 39887249 is a prime.

It is not a weakly prime, because it can be changed into another prime (39920057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19960008 + 19960009.

It is an arithmetic number, because the mean of its divisors is an integer number (19960009).

Almost surely, 2^39920017 is an apocalyptic number.

It is an amenable number.

39920017 is a deficient number, since it is larger than the sum of its proper divisors (1).

39920017 is an equidigital number, since it uses as much as digits as its factorization.

39920017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 39920017 is about 6318.2289448864. The cubic root of 39920017 is about 341.7670888895.

The spelling of 39920017 in words is "thirty-nine million, nine hundred twenty thousand, seventeen".