3991919796 has 18 divisors (see below), whose sum is σ = 10090686242. Its totient is φ = 1330639920.

The previous prime is 3991919731. The next prime is 3991919801. The reversal of 3991919796 is 6979191993.

It can be written as a sum of positive squares in only one way, i.e., 3328136100 + 663783696 = 57690^2 + 25764^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×3991919796³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55443295 + ... + 55443366.

Almost surely, 2^3991919796 is an apocalyptic number.

3991919796 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3991919796 is an abundant number, since it is smaller than the sum of its proper divisors (6098766446).

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

3991919796 is a wasteful number, since it uses less digits than its factorization.

3991919796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110886671 (or 110886666 counting only the distinct ones).

The product of its digits is 7440174, while the sum is 63.

The square root of 3991919796 is about 63181.6412892226. The cubic root of 3991919796 is about 1586.3314544032.

The spelling of 3991919796 in words is "three billion, nine hundred ninety-one million, nine hundred nineteen thousand, seven hundred ninety-six".