39920173 has 2 divisors, whose sum is σ = 39920174. Its totient is φ = 39920172.

The previous prime is 39920171. The next prime is 39920189. The reversal of 39920173 is 37102993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34597924 + 5322249 = 5882^2 + 2307^2 .

It is a cyclic number.

It is not a de Polignac number, because 39920173 - 2¹ = 39920171 is a prime.

Together with 39920171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39920171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19960086 + 19960087.

It is an arithmetic number, because the mean of its divisors is an integer number (19960087).

Almost surely, 2^39920173 is an apocalyptic number.

It is an amenable number.

39920173 is a deficient number, since it is larger than the sum of its proper divisors (1).

39920173 is an equidigital number, since it uses as much as digits as its factorization.

39920173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 39920173 is about 6318.2412901060. The cubic root of 39920173 is about 341.7675340763.

The spelling of 39920173 in words is "thirty-nine million, nine hundred twenty thousand, one hundred seventy-three".