139866193 has 2 divisors, whose sum is σ = 139866194. Its totient is φ = 139866192.

The previous prime is 139866131. The next prime is 139866247. The reversal of 139866193 is 391668931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100641024 + 39225169 = 10032^2 + 6263^2 .

It is a cyclic number.

It is not a de Polignac number, because 139866193 - 2²¹ = 137769041 is a prime.

It is not a weakly prime, because it can be changed into another prime (139863193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69933096 + 69933097.

It is an arithmetic number, because the mean of its divisors is an integer number (69933097).

Almost surely, 2^139866193 is an apocalyptic number.

It is an amenable number.

139866193 is a deficient number, since it is larger than the sum of its proper divisors (1).

139866193 is an equidigital number, since it uses as much as digits as its factorization.

139866193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 46.

The square root of 139866193 is about 11826.5038367220. The cubic root of 139866193 is about 519.0839307736.

The spelling of 139866193 in words is "one hundred thirty-nine million, eight hundred sixty-six thousand, one hundred ninety-three".