3985791939 has 24 divisors (see below), whose sum is σ = 5781812400. Its totient is φ = 2645889792.

The previous prime is 3985791863. The next prime is 3985791947. The reversal of 3985791939 is 9391975893.

3985791939 is a `hidden beast` number, since 398 + 57 + 9 + 193 + 9 = 666.

It is not a de Polignac number, because 3985791939 - 2¹² = 3985787843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3985795939) 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, 3799087 + ... + 3800135.

It is an arithmetic number, because the mean of its divisors is an integer number (240908850).

Almost surely, 2^3985791939 is an apocalyptic number.

3985791939 is a deficient number, since it is larger than the sum of its proper divisors (1796020461).

3985791939 is a wasteful number, since it uses less digits than its factorization.

3985791939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451 (or 2448 counting only the distinct ones).

The product of its digits is 16533720, while the sum is 63.

The square root of 3985791939 is about 63133.1286964301. The cubic root of 3985791939 is about 1585.5193313248.

The spelling of 3985791939 in words is "three billion, nine hundred eighty-five million, seven hundred ninety-one thousand, nine hundred thirty-nine".