439342639 has 2 divisors, whose sum is σ = 439342640. Its totient is φ = 439342638.

The previous prime is 439342613. The next prime is 439342649. The reversal of 439342639 is 936243934.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-439342639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 439342595 and 439342604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439342609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219671319 + 219671320.

It is an arithmetic number, because the mean of its divisors is an integer number (219671320).

Almost surely, 2^439342639 is an apocalyptic number.

439342639 is a deficient number, since it is larger than the sum of its proper divisors (1).

439342639 is an equidigital number, since it uses as much as digits as its factorization.

439342639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 43.

The square root of 439342639 is about 20960.5018785333. The cubic root of 439342639 is about 760.2115287242.

The spelling of 439342639 in words is "four hundred thirty-nine million, three hundred forty-two thousand, six hundred thirty-nine".