139534939 has 2 divisors, whose sum is σ = 139534940. Its totient is φ = 139534938.

The previous prime is 139534897. The next prime is 139534973. The reversal of 139534939 is 939435931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139534939 - 2¹⁵ = 139502171 is a prime.

It is not a weakly prime, because it can be changed into another prime (139534139) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69767469 + 69767470.

It is an arithmetic number, because the mean of its divisors is an integer number (69767470).

Almost surely, 2^139534939 is an apocalyptic number.

139534939 is a deficient number, since it is larger than the sum of its proper divisors (1).

139534939 is an equidigital number, since it uses as much as digits as its factorization.

139534939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 393660, while the sum is 46.

The square root of 139534939 is about 11812.4908042292. The cubic root of 139534939 is about 518.6738136723.

The spelling of 139534939 in words is "one hundred thirty-nine million, five hundred thirty-four thousand, nine hundred thirty-nine".