3965813994 has 32 divisors (see below), whose sum is σ = 8156223936. Its totient is φ = 1284595200.

The previous prime is 3965813993. The next prime is 3965814029. The reversal of 3965813994 is 4993185693.

It is not an unprimeable number, because it can be changed into a prime (3965813993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172794 + ... + 194394.

It is an arithmetic number, because the mean of its divisors is an integer number (254881998).

Almost surely, 2^3965813994 is an apocalyptic number.

3965813994 is an abundant number, since it is smaller than the sum of its proper divisors (4190409942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3965813994 is a wasteful number, since it uses less digits than its factorization.

3965813994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22470.

The product of its digits is 6298560, while the sum is 57.

The square root of 3965813994 is about 62974.7091616944. The cubic root of 3965813994 is about 1582.8658655083.

The spelling of 3965813994 in words is "three billion, nine hundred sixty-five million, eight hundred thirteen thousand, nine hundred ninety-four".