139240019 has 2 divisors, whose sum is σ = 139240020. Its totient is φ = 139240018.

The previous prime is 139240009. The next prime is 139240021. The reversal of 139240019 is 910042931.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139240019 is a prime.

It is a super-2 number, since 2×139240019² = 38775565782240722, which contains 22 as substring.

Together with 139240021, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 139239973 and 139240000.

It is not a weakly prime, because it can be changed into another prime (139240009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69620009 + 69620010.

It is an arithmetic number, because the mean of its divisors is an integer number (69620010).

Almost surely, 2^139240019 is an apocalyptic number.

139240019 is a deficient number, since it is larger than the sum of its proper divisors (1).

139240019 is an equidigital number, since it uses as much as digits as its factorization.

139240019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 139240019 is about 11800.0008050847. Note that the first 3 decimals coincide. The cubic root of 139240019 is about 518.3081342253.

The spelling of 139240019 in words is "one hundred thirty-nine million, two hundred forty thousand, nineteen".