140138239 has 2 divisors, whose sum is σ = 140138240. Its totient is φ = 140138238.

The previous prime is 140138231. The next prime is 140138263. The reversal of 140138239 is 932831041.

It is a weak prime.

It is an emirp because it is prime and its reverse (932831041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140138239 - 2³ = 140138231 is a prime.

It is a super-2 number, since 2×140138239² = 39277452060042242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 140138239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140138231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70069119 + 70069120.

It is an arithmetic number, because the mean of its divisors is an integer number (70069120).

Almost surely, 2^140138239 is an apocalyptic number.

140138239 is a deficient number, since it is larger than the sum of its proper divisors (1).

140138239 is an equidigital number, since it uses as much as digits as its factorization.

140138239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 140138239 is about 11837.9997888157. Note that the first 3 decimals coincide. The cubic root of 140138239 is about 519.4202599620.

The spelling of 140138239 in words is "one hundred forty million, one hundred thirty-eight thousand, two hundred thirty-nine".