139394273 has 2 divisors, whose sum is σ = 139394274. Its totient is φ = 139394272.

The previous prime is 139394257. The next prime is 139394287. The reversal of 139394273 is 372493931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131515024 + 7879249 = 11468^2 + 2807^2 .

It is a cyclic number.

It is not a de Polignac number, because 139394273 - 2⁴ = 139394257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139394273.

It is not a weakly prime, because it can be changed into another prime (139394173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69697136 + 69697137.

It is an arithmetic number, because the mean of its divisors is an integer number (69697137).

Almost surely, 2^139394273 is an apocalyptic number.

It is an amenable number.

139394273 is a deficient number, since it is larger than the sum of its proper divisors (1).

139394273 is an equidigital number, since it uses as much as digits as its factorization.

139394273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 41.

The square root of 139394273 is about 11806.5351818389. The cubic root of 139394273 is about 518.4994623545.

The spelling of 139394273 in words is "one hundred thirty-nine million, three hundred ninety-four thousand, two hundred seventy-three".