3977686 has 4 divisors (see below), whose sum is σ = 5966532. Its totient is φ = 1988842.

The previous prime is 3977681. The next prime is 3977693. The reversal of 3977686 is 6867793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6867793 = 53 ⋅129581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3977681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994420 + ... + 994423.

It is an arithmetic number, because the mean of its divisors is an integer number (1491633).

Almost surely, 2^3977686 is an apocalyptic number.

3977686 is a deficient number, since it is larger than the sum of its proper divisors (1988846).

3977686 is a wasteful number, since it uses less digits than its factorization.

3977686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988845.

The product of its digits is 381024, while the sum is 46.

The square root of 3977686 is about 1994.4136983084. The cubic root of 3977686 is about 158.4443773817. Note that the first 3 decimals are identical.

The spelling of 3977686 in words is "three million, nine hundred seventy-seven thousand, six hundred eighty-six".