139459739 has 2 divisors, whose sum is σ = 139459740. Its totient is φ = 139459738.

The previous prime is 139459609. The next prime is 139459751. The reversal of 139459739 is 937954931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139459739 is a prime.

It is not a weakly prime, because it can be changed into another prime (139459759) 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, 69729869 + 69729870.

It is an arithmetic number, because the mean of its divisors is an integer number (69729870).

Almost surely, 2^139459739 is an apocalyptic number.

139459739 is a deficient number, since it is larger than the sum of its proper divisors (1).

139459739 is an equidigital number, since it uses as much as digits as its factorization.

139459739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 918540, while the sum is 50.

The square root of 139459739 is about 11809.3073039870. The cubic root of 139459739 is about 518.5806200964.

The spelling of 139459739 in words is "one hundred thirty-nine million, four hundred fifty-nine thousand, seven hundred thirty-nine".