139706407 has 2 divisors, whose sum is σ = 139706408. Its totient is φ = 139706406.

The previous prime is 139706401. The next prime is 139706417. The reversal of 139706407 is 704607931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139706407 - 2⁷ = 139706279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139706401) 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, 69853203 + 69853204.

It is an arithmetic number, because the mean of its divisors is an integer number (69853204).

Almost surely, 2^139706407 is an apocalyptic number.

139706407 is a deficient number, since it is larger than the sum of its proper divisors (1).

139706407 is an equidigital number, since it uses as much as digits as its factorization.

139706407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 139706407 is about 11819.7464862830. The cubic root of 139706407 is about 518.8861847511.

The spelling of 139706407 in words is "one hundred thirty-nine million, seven hundred six thousand, four hundred seven".