3966505839 has 24 divisors (see below), whose sum is σ = 5756526672. Its totient is φ = 2631847680.

The previous prime is 3966505817. The next prime is 3966505853. The reversal of 3966505839 is 9385056693.

3966505839 is a `hidden beast` number, since 3 + 9 + 6 + 6 + 50 + 583 + 9 = 666.

It is not a de Polignac number, because 3966505839 - 2¹⁷ = 3966374767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3966505859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3071784 + ... + 3073074.

It is an arithmetic number, because the mean of its divisors is an integer number (239855278).

Almost surely, 2^3966505839 is an apocalyptic number.

3966505839 is a deficient number, since it is larger than the sum of its proper divisors (1790020833).

3966505839 is a wasteful number, since it uses less digits than its factorization.

3966505839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647 (or 2644 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 54.

The square root of 3966505839 is about 62980.2019606162. The cubic root of 3966505839 is about 1582.9579049704.

The spelling of 3966505839 in words is "three billion, nine hundred sixty-six million, five hundred five thousand, eight hundred thirty-nine".