139955243 has 2 divisors, whose sum is σ = 139955244. Its totient is φ = 139955242.

The previous prime is 139955213. The next prime is 139955279. The reversal of 139955243 is 342559931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139955243 - 2²⁶ = 72846379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139955243.

It is not a weakly prime, because it can be changed into another prime (139955213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69977621 + 69977622.

It is an arithmetic number, because the mean of its divisors is an integer number (69977622).

Almost surely, 2^139955243 is an apocalyptic number.

139955243 is a deficient number, since it is larger than the sum of its proper divisors (1).

139955243 is an equidigital number, since it uses as much as digits as its factorization.

139955243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 41.

The square root of 139955243 is about 11830.2680865651. The cubic root of 139955243 is about 519.1940708450.

The spelling of 139955243 in words is "one hundred thirty-nine million, nine hundred fifty-five thousand, two hundred forty-three".