72339173 has 2 divisors, whose sum is σ = 72339174. Its totient is φ = 72339172.

The previous prime is 72339143. The next prime is 72339187. The reversal of 72339173 is 37193327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70845889 + 1493284 = 8417^2 + 1222^2 .

It is an emirp because it is prime and its reverse (37193327) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72339173 - 2¹⁸ = 72077029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72339103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36169586 + 36169587.

It is an arithmetic number, because the mean of its divisors is an integer number (36169587).

Almost surely, 2^72339173 is an apocalyptic number.

It is an amenable number.

72339173 is a deficient number, since it is larger than the sum of its proper divisors (1).

72339173 is an equidigital number, since it uses as much as digits as its factorization.

72339173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 35.

The square root of 72339173 is about 8505.2438530591. The cubic root of 72339173 is about 416.6689899248.

The spelling of 72339173 in words is "seventy-two million, three hundred thirty-nine thousand, one hundred seventy-three".