139720019 has 2 divisors, whose sum is σ = 139720020. Its totient is φ = 139720018.

The previous prime is 139720013. The next prime is 139720039. The reversal of 139720019 is 910027931.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139720019 - 2⁴ = 139720003 is a prime.

It is a super-2 number, since 2×139720019² = 39043367418720722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (139720013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69860009 + 69860010.

It is an arithmetic number, because the mean of its divisors is an integer number (69860010).

Almost surely, 2^139720019 is an apocalyptic number.

139720019 is a deficient number, since it is larger than the sum of its proper divisors (1).

139720019 is an equidigital number, since it uses as much as digits as its factorization.

139720019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 139720019 is about 11820.3222883304. The cubic root of 139720019 is about 518.9030363986.

The spelling of 139720019 in words is "one hundred thirty-nine million, seven hundred twenty thousand, nineteen".