139029439 has 2 divisors, whose sum is σ = 139029440. Its totient is φ = 139029438.

The previous prime is 139029361. The next prime is 139029491. The reversal of 139029439 is 934920931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139029439 - 2⁹ = 139028927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139029139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69514719 + 69514720.

It is an arithmetic number, because the mean of its divisors is an integer number (69514720).

Almost surely, 2^139029439 is an apocalyptic number.

139029439 is a deficient number, since it is larger than the sum of its proper divisors (1).

139029439 is an equidigital number, since it uses as much as digits as its factorization.

139029439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 139029439 is about 11791.0745481487. The cubic root of 139029439 is about 518.0467141823.

The spelling of 139029439 in words is "one hundred thirty-nine million, twenty-nine thousand, four hundred thirty-nine".