3991469977 has 8 divisors (see below), whose sum is σ = 4415660352. Its totient is φ = 3577501200.

The previous prime is 3991469941. The next prime is 3991470031. The reversal of 3991469977 is 7799641993.

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

It is a cyclic number.

It is not a de Polignac number, because 3991469977 - 2⁷ = 3991469849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3991469927) 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, 2554578 + ... + 2556139.

It is an arithmetic number, because the mean of its divisors is an integer number (551957544).

Almost surely, 2^3991469977 is an apocalyptic number.

It is an amenable number.

3991469977 is a deficient number, since it is larger than the sum of its proper divisors (424190375).

3991469977 is a wasteful number, since it uses less digits than its factorization.

3991469977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5110799.

The product of its digits is 23147208, while the sum is 64.

The square root of 3991469977 is about 63178.0814602659. The cubic root of 3991469977 is about 1586.2718683002.

The spelling of 3991469977 in words is "three billion, nine hundred ninety-one million, four hundred sixty-nine thousand, nine hundred seventy-seven".