439660139 has 2 divisors, whose sum is σ = 439660140. Its totient is φ = 439660138.

The previous prime is 439660121. The next prime is 439660181. The reversal of 439660139 is 931066934.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-439660139 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 439660096 and 439660105.

It is not a weakly prime, because it can be changed into another prime (439660189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219830069 + 219830070.

It is an arithmetic number, because the mean of its divisors is an integer number (219830070).

Almost surely, 2^439660139 is an apocalyptic number.

439660139 is a deficient number, since it is larger than the sum of its proper divisors (1).

439660139 is an equidigital number, since it uses as much as digits as its factorization.

439660139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 439660139 is about 20968.0742797234. The cubic root of 439660139 is about 760.3946121306.

The spelling of 439660139 in words is "four hundred thirty-nine million, six hundred sixty thousand, one hundred thirty-nine".