3991319879 has 8 divisors (see below), whose sum is σ = 4013391888. Its totient is φ = 3969266560.

The previous prime is 3991319861. The next prime is 3991319887. The reversal of 3991319879 is 9789131993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3991319879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991319179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 738224 + ... + 743610.

It is an arithmetic number, because the mean of its divisors is an integer number (501673986).

Almost surely, 2^3991319879 is an apocalyptic number.

3991319879 is a deficient number, since it is larger than the sum of its proper divisors (22072009).

3991319879 is a wasteful number, since it uses less digits than its factorization.

3991319879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9345.

The product of its digits is 3306744, while the sum is 59.

The square root of 3991319879 is about 63176.8935529439. The cubic root of 3991319879 is about 1586.2519842959.

The spelling of 3991319879 in words is "three billion, nine hundred ninety-one million, three hundred nineteen thousand, eight hundred seventy-nine".