39965173 has 2 divisors, whose sum is σ = 39965174. Its totient is φ = 39965172.

The previous prime is 39965137. The next prime is 39965179. The reversal of 39965173 is 37156993.

It is a happy number.

Together with previous prime (39965137) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37724164 + 2241009 = 6142^2 + 1497^2 .

It is an emirp because it is prime and its reverse (37156993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39965173 - 2²¹ = 37868021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39965179) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19982586 + 19982587.

It is an arithmetic number, because the mean of its divisors is an integer number (19982587).

Almost surely, 2^39965173 is an apocalyptic number.

It is an amenable number.

39965173 is a deficient number, since it is larger than the sum of its proper divisors (1).

39965173 is an equidigital number, since it uses as much as digits as its factorization.

39965173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153090, while the sum is 43.

The square root of 39965173 is about 6321.8014046631. The cubic root of 39965173 is about 341.8959049611.

The spelling of 39965173 in words is "thirty-nine million, nine hundred sixty-five thousand, one hundred seventy-three".