439639639 has 2 divisors, whose sum is σ = 439639640. Its totient is φ = 439639638.

The previous prime is 439639633. The next prime is 439639643. The reversal of 439639639 is 936936934.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 439639639 - 2⁹ = 439639127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439639633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219819819 + 219819820.

It is an arithmetic number, because the mean of its divisors is an integer number (219819820).

Almost surely, 2^439639639 is an apocalyptic number.

439639639 is a deficient number, since it is larger than the sum of its proper divisors (1).

439639639 is an equidigital number, since it uses as much as digits as its factorization.

439639639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2834352, while the sum is 52.

The square root of 439639639 is about 20967.5854356194. The cubic root of 439639639 is about 760.3827936595.

The spelling of 439639639 in words is "four hundred thirty-nine million, six hundred thirty-nine thousand, six hundred thirty-nine".