3991677 has 4 divisors (see below), whose sum is σ = 5322240. Its totient is φ = 2661116.

The previous prime is 3991667. The next prime is 3991679. The reversal of 3991677 is 7761993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3991677 - 2⁶ = 3991613 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665277 + ... + 665282.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^3991677 is an apocalyptic number.

It is an amenable number.

3991677 is a deficient number, since it is larger than the sum of its proper divisors (1330563).

3991677 is a wasteful number, since it uses less digits than its factorization.

3991677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330562.

The product of its digits is 71442, while the sum is 42.

The square root of 3991677 is about 1997.9181664923. The cubic root of 3991677 is about 158.6299292540.

It can be divided in two parts, 39916 and 77, that added together give a palindrome (39993).

The spelling of 3991677 in words is "three million, nine hundred ninety-one thousand, six hundred seventy-seven".