139623173 has 2 divisors, whose sum is σ = 139623174. Its totient is φ = 139623172.

The previous prime is 139623167. The next prime is 139623203. The reversal of 139623173 is 371326931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138697729 + 925444 = 11777^2 + 962^2 .

It is a cyclic number.

It is not a de Polignac number, because 139623173 - 2⁴ = 139623157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139623103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69811586 + 69811587.

It is an arithmetic number, because the mean of its divisors is an integer number (69811587).

Almost surely, 2^139623173 is an apocalyptic number.

It is an amenable number.

139623173 is a deficient number, since it is larger than the sum of its proper divisors (1).

139623173 is an equidigital number, since it uses as much as digits as its factorization.

139623173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 35.

The square root of 139623173 is about 11816.2249893949. The cubic root of 139623173 is about 518.7831172935.

The spelling of 139623173 in words is "one hundred thirty-nine million, six hundred twenty-three thousand, one hundred seventy-three".