40439393173 has 2 divisors, whose sum is σ = 40439393174. Its totient is φ = 40439393172.

The previous prime is 40439393171. The next prime is 40439393177. The reversal of 40439393173 is 37139393404.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39171534724 + 1267858449 = 197918^2 + 35607^2 .

It is a cyclic number.

It is not a de Polignac number, because 40439393173 - 2¹ = 40439393171 is a prime.

Together with 40439393171, 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 (40439393171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20219696586 + 20219696587.

It is an arithmetic number, because the mean of its divisors is an integer number (20219696587).

Almost surely, 2^40439393173 is an apocalyptic number.

It is an amenable number.

40439393173 is a deficient number, since it is larger than the sum of its proper divisors (1).

40439393173 is an equidigital number, since it uses as much as digits as its factorization.

40439393173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 46.

The spelling of 40439393173 in words is "forty billion, four hundred thirty-nine million, three hundred ninety-three thousand, one hundred seventy-three".